Crime Scene Investigation Features and Benefits

CSI: Vegas, bis einschließlich Staffel elf CSI: Den Tätern auf der Spur war eine US-amerikanische Fernsehserie, die die Arbeit der Tatortgruppe der Kriminalpolizei bei der Beweis- und Spurensicherung schildert. Als Crime Scene Investigation (kurz CSI) bezeichnet man die US-amerikanische und kanadische Spurensicherung. Auch wird der Begriff CSU (Crime Scene. Many translated example sentences containing "crime scene investigation" – German-English dictionary and search engine for German translations. Finden Sie CSI: Crime Scene Investigation - Die komplette Season 1​ im Set - Deutsche Originalware [72 DVDs] in unserem vielfältigen DVD-. Finden Sie CSI: Crime Scene Investigation - Las Vegas - Die komplette Season + Finale im Set - Deutsche Originalware [91 DVDs] in unserem.

Crime Scene Investigation

Request PDF | On May 12, , Ben W. Morrison and others published Diagnostic Cues in Major Crime Scene Investigation. | Find, read and cite all the​. CSI: Crime Scene Investigation - Mord in 3 Dimensionen (Adventure) für PC. Alles zum Spiel mit Wertung, Download, Systemanforderungen, Release Termin,​. Ein Team von forensischen Spezialisten der Polizei in Las Vegas untersucht Tatorte und arbeitet daran, grausame Verbrechen in der Stadt der Sünden.

The lab can identify the substance, determine its purity and see what else is in the sample in trace amounts. These tests might determine drug possession, drug tampering or whether the composition could have killed or incapacitated a victim.

Technicians discover a lot of the trace evidence for a crime in the lab when they shake out bedding, clothing, towels, couch cushions and other items found at the scene.

At the CBI Denver Crime Lab, technicians shake out the items in a sterile room, onto a large, white slab covered with paper.

The technicians then send any trace evidence they find to the appropriate department. In the Denver Crime Lab, things like soil, glass and paint stay in the trace-evidence lab, illicit drugs and unknown substances go to the chemistry lab, and hair goes to the DNA lab.

Body fluids found at a crime scene might include blood, semen, saliva, and vomit. To identify and collect these pieces of evidence, a CSI might use smear slides, a scalpel, tweezers, scissors, sterile cloth squares, a UV light, protective eyewear and luminol.

He'll also use a blood collection kit to get samples from any suspects or from a living victim to use for comparison. If the victim is dead and there is blood on the body, the CSI collects a blood sample either by submitting a piece of clothing or by using a sterile cloth square and a small amount of distilled water to remove some blood from the body.

Blood or saliva collected from the body may belong to someone else, and the lab will perform DNA analysis so the sample can be used later to compare to blood or saliva taken from a suspect.

The CSI will also scrape the victim's nails for skin -- if there was a struggle, the suspect's skin and therefore DNA may be under the victim's nails.

If there is dried blood on any furniture at the scene, the CSI will try to send the entire piece of furniture to the lab.

A couch is not an uncommon piece of evidence to collect. If the blood is on something that can't reasonably go to the lab, like a wall or a bathtub, the CSI can collect it by scraping it into a sterile container using a scalpel.

The CSI may also use luminol and a portable UV light to reveal blood that has been washed off a surface. If there is blood at the scene, there may also be blood spatter patterns.

These patterns can reveal the type of weapon that was used -- for instance, a "cast-off pattern" is left when something like a baseball bat contacts a blood source and then swings back.

The droplets are large and often tear-drop shaped. This type of pattern can indicate multiple blows from a blunt object, because the first blow typically does not contact any blood.

A "high-energy pattern," on the other hand, is made up of many tiny droplets and may indicate a gun shot. Blood spatter analysis can indicate which direction the blood came from and how many separate incidents created the pattern.

Analyzing a blood pattern involves studying the size and shape of the stain, the shape and size of the blood droplets and the concentration of the droplets within the pattern.

The CSI takes pictures of the pattern and may call in a blood-spatter specialist to analyze it. A CSI may use combs, tweezers, containers and a filtered vacuum device to collect any hair or fibers at the scene.

In a rape case with a live victim, the CSI accompanies the victim to the hospital to obtain any hairs or fibers found on the victim's body during the medical examination.

The CSI seals any hair or fiber evidence in separate containers for transport to the lab. A CSI might recover carpet fibers from a suspect's shoes.

The lab can compare these fibers to carpet fibers from the victim's home. Analysts can use hair DNA to identify or eliminate suspects by comparison.

The presence of hair on a tool or weapon can identify it as the weapon used in the crime. The crime lab can determine what type of animal the hair came from human?

Tools for recovering fingerprints include brushes, powders, tape, chemicals, lift cards, a magnifying glass and Super Glue. A crime lab can use fingerprints to identify the victim or identify or rule out a suspect.

There are several types of prints a CSI might find at a crime scene:. A perpetrator might leave prints on porous or nonporous surfaces.

Paper, unfinished wood and cardboard are porous surfaces that will hold a print, and glass, plastic and metal are nonporous surfaces.

A CSI will typically look for latent prints on surfaces the perpetrator is likely to have touched.

For instance, if there are signs of forced entry on the front door, the outside door knob and door surface are logical places to look for prints. Breathing on a surface or shining a very strong light on it might make a latent print temporarily visible.

When you see a TV detective turn a doorknob using a handkerchief, she's probably destroying a latent print. The only way not to corrupt a latent print on a nonporous surface is to not touch it.

Proper methods for recovering latent prints include:. Powder for nonporous surfaces : Metallic silver powder or velvet black powder A CSI uses whichever powder contrasts most with the color of material holding the print.

He gently brushes powder onto the surface in a circular motion until a print is visible; then he starts brushing in the direction of the print ridges.

He takes a photo of the print before using tape to lift it this makes it stand up better in court.

He adheres clear tape to the powdered print, draws it back in a smooth motion and then adheres it to a fingerprint card of a contrasting color to the powder.

Chemicals for porous surfaces : Iodine, ninhydrin, silver nitrate The CSI sprays the chemical onto the surface of the material or dips the material into a chemical solution to reveal the latent print.

He then places the plate, the heat source and the object containing the latent print in an airtight container.

The fumes from the Super Glue make the latent print visible without disturbing the material it's on. A latent fingerprint is an example of a two-dimensional impression.

A footwear impression in mud or a tool mark on a window frame is an example of a three-dimensional impression. If it's not possible to submit the entire object containing the impression to the crime lab, a CSI makes a casting at the scene.

A casting kit might include multiple casting compounds dental gypsum, Silicone rubber , snow wax for making a cast in snow , a bowl, a spatula and cardboard boxes to hold the casts.

If a CSI finds a footwear impression in mud, she'll photograph it and then make a cast. To prepare the casting material, she combines a casting material and water in a Ziploc-type bag and kneads it for about two minutes, until the consistency is like pancake batter.

She then pours the mixture into the edge of the track so that it flows into the impression without causing air bubbles. Once the material overflows the impression, she lets it set for at least 30 minutes and then carefully lifts the cast out of the mud.

Without cleaning the cast or brushing anything off it this would destroy any trace evidence , she puts the cast into a cardboard box or paper bag for transport to the lab.

For toolmark impressions, a cast is much harder to use for comparison than it is with footwear. If it's not feasible to transport the entire item containing the tool mark, a CSI can make a silicone-rubber cast and hope for the best.

There are two types of tool marks a CSI might find at a crime scene:. It can also compare the tool mark in evidence to another toolmark to determine if the marks were made by the same tool.

If a CSI finds any firearms, bullets or casings at the scene, she puts gloves on, picks up the gun by the barrel not the grip and bags everything separately for the lab.

Forensic scientists can recover serial numbers and match both bullets and casings not only to the weapon they were fired from, but also to bullets and casings found at other crime scenes throughout the state most ballistics databases are statewide.

When there are bullet holes in the victim or in other objects at the scene, specialists can determine where and from what height the bullet was fired from, as well as the position of the victim when it was fired, using a laser trajectory kit.

If there are bullets embedded in a wall or door frame, the CSI cuts out the portion of the wall or frame containing the bullet -- digging the bullet out can damage it and make it unsuitable for comparison.

A CSI collects and preserves any diaries, planners, phone books or suicide notes found at a crime scene. He also delivers to the lab any signed contracts, receipts, a torn up letter in the trash or any other written, typed or photocopied evidence that might be related to the crime.

A documents lab can often reconstruct a destroyed document, even one that has been burned, as well as determine if a document has been altered.

Technicians analyze documents for forgery, determine handwriting matches to the victim and suspects, and identify what type of machine was used to produce the document.

They can rule out a printer or photocopier found at the scene or determine compatibility or incompatibility with a machine found in a suspect's possession.

An evidence tag may include identification information such as time, date and exact location of recovery and who recovered the item, or it may simply reflect a serial number that corresponds to an entry in the evidence log that contains this information.

The crime scene report documents the complete body of evidence recovered from the scene, including the photo log, evidence recovery log and a written report describing the crime scene investigation.

In a CSI van, you might see hack saws, pliers, a pipe wrench, a pry bar, wire cutters, bolt cutters, shovels, sifters, a slim jim, a pocket knife, measuring tapes, orange marker flags, a flashlight, batteries, chalk, forceps, Vise-Grips, a compass, a magnet, a metal detector, distilled water, kneeling pads, and stuffed animals for living child victims.

In , the FBI established its own forensics lab to serve police departments and other investigating authorities all over the country.

The FBI lab is one of the largest in the world. The Denver Crime Lab at the Colorado Bureau of Investigation provides evidence collection and laboratory analysis for any police department in Colorado that requests its services.

It also conducts state investigations that don't fall under the jurisdiction of any local authority. Some specialty departments in the Denver Crime Lab include latent fingerprints and impressions , which develops latent fingerprints; analyzes and compares fingerprints, footwear and tire impressions; and runs fingerprints through the Automated Fingerprint Identification System AFIS, which uses the FBI database for comparison against hundreds of millions of prints.

The trace evidence department runs GSR analysis, and identifies and compares samples of soil, glass, fibers and paint. The chemistry section conducts analysis and comparison of illicit drugs, explosives and unknown chemicals.

The computer crimes team recovers evidence from computers and performs computer enhancement on audio or video evidence. There's also firearms and toolmark identification , which identifies firearms; tests firearms to establish barrel pattern and distance of gun from entrance wound; and identifies and compares bullets, casings and toolmark impressions.

Then there's serology and DNA , which conducts body fluid analysis, including DNA analysis for blood stains, semen and hair for identification and comparison.

Lastly, there's a questioned document section that detects forgery and alterations; conducts handwriting comparisons; reconstructs destroyed documents; and identifies and compares printers, typewriters or copiers used to produce a document.

Often, a piece of evidence passes through more than one department for analysis. Each department delivers a complete report of the evidence it analyzed for the case, including the actual results numbers, measurements, chemical contents and any expert conclusions the scientists have drawn from these results.

The CSI in charge might compile the results and deliver them to the lead detective on the case, or the lab might send the results directly to the detective squad.

The role of a crime scene investigator doesn't end when he completes his evidence report. It doesn't even end when the lab results related to that evidence are delivered to the detectives on the case.

A big part of a CSI's job is testifying in court about the evidence he collected, the methods he used to recover it and the number of people who came into contact with it before it ended up as the prosecution's Exhibit D.

And the defense attorney's job is to attack the evidence, which sometimes means attacking the person who collected it. This is why search warrants, evidence logs, photographs and extremely detailed reports are so critical to the CSI process.

The defense will try to get every piece of incriminating evidence thrown out of court. The legality of the search, the untainted preservation of the evidence and the full, undisputable documentation of the crime scene are prime considerations in a crime scene investigation.

So, does Hollywood get it right? Viewers don't want to watch a bunch of CSIs waiting around for a search warrant, and they would probably be unsatisfied if they never got a look at the suspect.

Scientifically speaking, "CSI" sometimes misses the mark. In reality, it's not possible to come up with a two-hour range for the time of death.

Also, you don't just scan a fingerprint into a computer and wait for it to spit out a photo of the suspect. Fingerprint-comparison software returns several possible matches that an expert then analyzes visually to determine a definite match.

Other places where Hollywood gets it wrong involves investigative process. Crime scene investigators almost always get warrants before searching a scene.

Pretty much the only scene that might not require a warrant is an apartment owned by the victim, who lived there alone and never shared the space with anyone else at any time.

This means there's a lot of waiting involved -- it's pretty unusual for a CSI to arrive on a scene and just start searching.

What usually happens is the CSI arrives and determines which areas need to be searched, and then someone gets a hold of the district attorney, who gets a hold of a judge, who signs whatever search warrants are requested.

Once the district attorney brings the warrants to the scene, the search begins. And the search involves the evidence, not the neighbors of the victim.

CSIs do not deal with witnesses or suspects. They don't interview people at the scene, they don't interrogate anyone and they definitely don't pursue the perpetrator.

These are all the jobs of the detectives on the case. Also, it's rare for a CSI to handle an entire investigation from beginning to end, even if we're just talking about the evidence.

There are tons of people involved in collecting and analyzing evidence, including CSIs, forensic specialists, medical examiners and detectives. It's a rare CSI who has the time or expertise to do it all.

In Mr. Clayton's opinion, shows like "CSI" aren't making criminals any smarter. The truth is, crime scene investigation and forensic science are always trying to catch up with the criminals, not the other way around.

And while there are certainly people who meticulously plan a crime and how to get away with it, Mr.

Clayton's experience with crime scenes tells a different story: Most violent crimes are committed in the heat of the moment.

The perpetrator is in an agitated state, possibly under the influence of drugs or alcohol, and doesn't have the presence of mind to meticulously cover his tracks.

It's the rare criminal genius who studies forensic science so he can commit the perfect murder and get away with it. For more information on crime scene investigation, forensic science and related topics, check out the links that follow.

But he views his job as a chance to use science to help people. CSIs can be police officers or civilians. All police departments and law-enforcement agencies have different criteria.

Typically, a civilian CSI should have a two- or four-year degree. Clayton is not a police officer. He graduated from college with a bachelor's degree in biology and minors in chemistry and behavioral sciences.

Does Hollywood get it right on CSI, or not so much? The CSI arrives on the scene and makes sure it is secure. She does an initial walk-through to get an overall feel for the crime scene, finds out if anyone moved anything before she arrived, and generates initial theories based on visual examination.

She makes note of potential evidence. At this point, she touches nothing. The CSI thoroughly documents the scene by taking photographs and drawing sketches during a second walk-through.

Sometimes, the documentation stage includes a video walk-through, as well. She documents the scene as a whole and documents anything she has identified as evidence.

She still touches nothing. Now it's time to touch stuff — very, very carefully. The CSI systematically makes her way through the scene collecting all potential evidence , tagging it, logging it and packaging it so it remains intact on its way to the lab.

Depending on the task breakdown of the CSI unit she works for and her areas of expertise, she may or may not analyze the evidence in the lab.

The crime lab processes all of the evidence the CSI collected at the crime scene. When the lab results are in, they go to the lead detective on the case.

I have expertise in blood pattern identification blood spatter , trajectory determination, serology blood and body fluids , and photography.

I also have knowledge in many other areas firearms, fingerprints, questioned documents As a primary crime scene responder at the CBI, my role at the scene may involve one or more of my particular disciplines.

While I would not do a functionality test on a firearm here at the laboratory, my role at the crime scene would be to collect the gun and understand its potential evidentiary significance.

At the Crime Scene: Scene Recognition. Des Moines police officers secure a crime scene related to a double homicide on Nov.

Crime Scene Documentation. Joe Clayton's photography kit: He usually uses a digital Nikon D to photograph a crime scene. He might also use a Nikon Ns mm film format for special applications.

Finding Crime Evidence. Forensic specialists of the German police secure the crime scene after a deadly knife attack on May 10, , in Grafing, Bavaria.

Trace evidence gunshot residue, paint residue, broken glass, unknown chemicals, drugs Impressions fingerprints, footwear, tool marks Body fluids blood, semen, saliva, vomit Hair and fibers Weapons and firearms evidence knives, guns, bullet holes, cartridge casings Questioned documents diaries, suicide note, phone books; also includes electronic documents like answering machines and caller ID units.

Are there any stains or marks on the clothing? Is the clothing bunched up in particular direction? If so, this could indicate dragging.

Are there any bruises, cuts or marks on body? Any defense wounds? Any injuries indicating, consistent with or inconsistent with the preliminary cause of death?

Is there anything obviously missing? Is there a tan mark where a watch or ring should be? If blood is present in large amounts, does the direction of flow follow the laws of gravity?

If not, the body may have been moved. If no blood is present in the area surrounding the body, is this consistent with the preliminary cause of death?

Are there any bodily fluids present beside blood? Is there any insect activity on the body? If so, the CSI may call in a forensic entomologist to analyze the activity for clues as to how long the person has been dead.

Are the doors and windows locked or unlocked? Open or shut? Are there signs of forced entry, such as tool marks or broken locks?

Is the house in good order? If not, does it look like there was a struggle or was the victim just messy?

Is there mail lying around? Has it been opened? Is the kitchen in good order? Is there any partially eaten food? Is the table set? If so, for how many people?

Are there signs of a party, such as empty glasses or bottles or full ashtrays? If there are full ashtrays, what brands of cigarettes are present?

Are there any lipstick or teeth marks on the butts? Is there anything that seems out of place? A glass with lipstick marks in a man's apartment, or the toilet seat up in a woman's apartment?

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