Text: but uh they say that there it's almost down to zero where people come back and say they are positive and and they're not you know in other words there's very few mistakes and that of course has got to be critical it's got to be if you have a drug testing program it's got to be with a very very good agency you don't just have you know some local uh group do it it's got to be a a a highly qualified agency
Entailment: If you are doing a drug test, hire a highly qualified agency.
Contradiction: There are always a lot of mistakes with drug tests.