When Texas police are about to make a drug arrest, they "confirm" that the substance they have found is actually an illegal drug with inexpensive test kits. However, a commission that was created to review wrongful convictions in the state determined that these drug field test kits are unreliable and should not be used alone to make drug convictions.
If you have even seen a TV show or movie depicting crime scene investigators, then you know that all it takes is a footprint in the dirt or a tiny hair to accurately identify a criminal, right? Not quite. It turns out that Hollywood makes forensic evidence seem a lot more foolproof than it actually is.