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In real life, police and prosecutors have noticed that due to the CSI effect real-life criminals have started covering their tracks and are destroying potential evidence against them before leaving crime scenes such as picking up spent shell casings, or wearing gloves. Some criminals have even deliberately planted DNA samples from other plausible suspects to derail any investigation. One example of this is when double-murderer Jermaine McKinney of Ohio, who committed a double murder by breaking into a house and killing a mother and daughter, he then proceeded to clean the crime scene (and himself) with bleach to destroy DNA traces, burnt his clothing to destroy evidence, bundled the bodies before transporting them and lined his car trunk with plastic to prevent fiber and blood contamination, collected his cigarette butts and took numerous other steps. He was only caught because he was unable to dispose of his murder weapon (a crowbar) in an unexpectedly frozen lake and simply left it sitting on the ice. McKinney was a big fan of CSI, and this type of calculated behavior is no isolated incident. Some rapists have now begun forcing their victims to shower after an attack to wash away any forensic evidence. "[These shows] are actually educating potential killers even more," says Head of Los Angeles Homicide Division Captain Ray Peavy. "Sometimes I believe it may even encourage them when they see how simple it is to get away with on television." Peavy isn't alone in his thinking. "[Criminals] do clean up, and they tend to clean up much more carefully now," said Linda Johnson, a crime lab director at Jefferson County, Alabama. "A lot of them know they can use bleach and different detergents to mask our ability to take blood." However some law enforcement officials believe this can be a good thing, as many criminals end up generating more evidence by trying to dispose of it. Max Houck, director of the Forensic Science Initiative at West Virginia University, gave the example of a man who would not lick his envelopes to avoid leaving DNA, only to leave hair and fingerprints in the adhesive tape he'd use to seal the envelopes.

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