Not too long ago, someone submitted a container full of suspected pineapple juice for a substance of abuse screen. It almost managed to get past the toxicology ladies because it was so ridiculous, but one of the girls was adamant about it being pineapple juice and offered to drink it to prove her point. Although she did not drink it, she turned out to be right and the urine was not just from a person with rampant diabetes.

People do some strange things to avoid being caught.