Forensic Fact vs. Fiction
Inside the FBI
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Detecting Blood Stains
The FBI laboratory is equipped to determine whether a sample is actual blood, but ERTs can't do that at a scene. Instead, they use one of two tools to get the presumptive result: phenyltheline or hemostics. No matter which test an ERT picks, the results help them determine whether or not they should collect a sample to send to the FBI lab.
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