Florida woman jailed for 5 months because of a failed field drug test. The lab test took 7 months to come back, revealing it was a vitamin. She was initially charged with trafficking oxycodone. Charges were dropped, but these tests continue to be used after numerous reports of them being a failure

http://www.fox13news.com/news/fox-13-investigates/another-field-drug-test-mistake-sends-woman-to-jail-for-months