They use flashlights even to look at portraits in a table. This doesn't make sense to me. From your question, I'm unclear if you're asking why they use flashlights even when there are lights on, or why they use flashlights instead of using the lights.
The latter is easier to answer. They want to research and document the crime scene exactly as they found it. From Crime-Scene-Investigator :. Certain evidence such as shoeprints or gunshot residue is fragile and if not collected immediately can easily be destroyed or lost.
They are looking for a single fingerprint, or strand of hair. Even turning a light on or opening a curtain could erase evidence. Therefore, they document the entire scene first by taking pictures, checking for all prints and using only their flashlights rather than other light sources. Think of the season opener to Series 5, when Greg failed his entrance test to become a CSI for using a toilet at a crime scene - risking corrupting the crime scene and destroying evidence. If however you were asking why they use flashlights in addition to the lights in the room, I think Paulster2 in his comments above has answered perfectly.
The additional light source provides a greater level of illumination and clarity and makes it easier to find things. The flashlights are a conditioned stimulus for the viewer watching the TV show. CSI has been using visual markers for years to indicate that something is about to happen. Finch , Aug 14, Joined: Sep 27, Messages: 9, Likes Received: 1. Another thing is that they are not ordinary flashlights because they use special filters to help find bodily fluids and other clues left behind.
Dynamo1 , Aug 14, I found out the following from doing a search: "When they're going over the scene, they have to leave it exactly as it was left when the crime was committed well, when the perp left. It allows them to better reconstruct the scene so they can figure out what happened.
Plus, like previously mentioned, it helps to catch evidence that might not be seen otherwise. Kind of like why the photographers use flash on their cameras as well. Plus, if they wanted to do something like that they would have to do that for example, open a window like no one else would open a window. Latex gloves can still smear prints, y'know? Another reason might be is that they are supposed to be the night shift. Flashlights are essential for night shift folks.
Also, they do not want to disturb any fingerprints that may be on the light switch. And some of the flashlights have filters to see some bodily fluids. Joined: Jul 7, Messages: Likes Received: 0. Also, details stand out better when the flashlight is focused directly on an object : especially imprints. You get different types of flashlight, but usually, they are separate : you wouldn't get a flashlight that lights corners up and reveals bloiod at the same time.
UV light, on the other hand, is invisible, but it produces visible fluorescence from certain objects and substances. No filtration is required to view UV fluorescence, but eye protection in the form of clear glass or plastic lenses is recommended.
Blue-white stains appear all over the floors, walls and objects sitting around the crime scene! But in reality—this cannot happen. You see, blood does not fluoresce by applying UV or visible blue light.
So what can alternate light sources reveal? Although blood does not fluoresce, certain other physiological fluids will. UV alternate light sources can reveal the following: seminal fluid, saliva and urine stains. Also, certain narcotics will fluoresce as will bone and teeth fragments. And the CSIs would never touch the dead body.
On an episode of "CSI: Miami" called "About Face," the murder of a college student has the team of investigators worried about the return of a suspected serial murderer. Still, the scene at the victim's apartment looks more like a keg party, with lots of people roaming around and only a fluttering yellow police tape as a reminder that something bad happened [source: cbs.
The reality, however, is that access to crime scenes is very limited, be it to the general public, family members or other law enforcement personnel [source: Farquhar ]. It's all about maintaining the integrity of any evidence at the crime scene, and to do that you have to establish a perimeter to prevent anyone from gaining entry to the area. Everyone has to sign in with an officer and have a legitimate purpose for being there [source: Farquhar ].
Keeping an area secure means potential suspects can't remove anything incriminating and the media can't take photos of what might become key pieces of evidence.
Even chiefs of police can't just wander around a crime scene without good reason. The pace at which the evidence from crime scenes -- be it DNA samples or fingerprints -- analyzed on the shows is equally rapid. Indeed, in the "About Face" episode of "CSI: Miami," one of the lab workers reports that a DNA sample submitted that morning had already been definitively identified [source: cbs. In the real world, nothing happens so quickly.
Joe Dane, an attorney who worked as a deputy sheriff in Los Angeles County and still teaches courses at a police academy , including one about homicide investigation, says that DNA takes weeks to process.
The time investigators spend at a crime scene collecting and cataloguing evidence is also fast forwarded in the world of TV. It's slow and methodical," he says. Among the more interesting pieces of evidence in "About Face" and "Appendicitement" were -- honestly -- a raccoon attached to a dead person's face and a second appendix.
In fact, Novak says it can be extremely difficult to lift fingerprints or DNA from a gun, something seen as relatively easy on TV.
In watching "CSI," one might think that this realm of law enforcement has access to the most advanced technology available. In "About Face," for instance, one of the investigators plays with software that, according to the actor describing it, takes surveillance video and analyzes it for characteristics such as facial expressions to determine whether the person is shy, anxious or even deceptive [source: cbs.
In "Appendicitement," one of the lab workers pulls out a handheld device that instantaneously pulls up a suspected criminal's photo along with his entire rap sheet [source: tv. The reality is far different, which is not to say that the technology used in police departments -- which, remember, would likely not be touched by anyone doing CSI -- isn't powerful.
But it isn't graphics intensive and interconnected, meaning that databases with, say, fingerprint information would not be tied to one with photographs and mugshots [source: Novak ]. They're interested in data, not photos or fancy things. A popular way to transition between scenes on "CSI: Miami" is to show David Caruso, who plays Horatio Caine, speeding down the highway or climbing in and out of his Hummer.
On the Vegas version of CSI, Nick Stokes, played by George Eads, is fond of wearing a bulletproof vest, and just about all of the female actresses spend a lot of time in tight clothing.
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