We had purchased this because one night my husband was at a Bach party and did something which is very much unlike him to do. Well a couple months later we were forced to take legal action Agianst his “ co-parent “ . Well we needed to get a drug screen on her so we did the same. Remembering he had that one night of lapsed judgement we were worried about the results. Purchased this and followed the instructions to the “T” and the results came back and it didn’t work. Hope others have better luck