Test positive then turn negative?

Question

I had to go to a evaluation for a charge i recently got.... They tested me for drugs, the UA on the spot came out positive, but when they sent it out to the lab it turned negative? Now i'm not complaining.. really thats ******* awsome and now i dont have to take a drug class... but how does this happen? btw it was positive for pot, and I had smoked a joint 10 days prior to the test.. but that was the 1st time i had in a long time....

Answer 1

so this isnt really for the pregnancy test...your saying you had a test for pot and it was negative and now you dont need a drug class? cool....congrates i guess!