Contumacious
Radical Freedom
- Aug 16, 2009
- 19,744
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- Thread starter
- #41
Even trained lab scientists struggle with confirmation bias — the tendency to take any new evidence as confirmation of expectations — and police officers can see the tests as affirming their decisions to stop and search a person. Labs rarely notify officers when a false positive is found, so they have little experience to prompt skepticism. As far as they know, the system works. By our estimate, though, every year at least 100,000 people nationwide plead guilty to drug-possession charges that rely on field-test results as evidence. At that volume, even the most modest of error rates could produce thousands of wrongful convictions.