Given the task definition and input, reply with output. In this task, You are given a review of Amazon's food products. Your task is to divide them into two classes: negative or positive, depending on the content of the review.

I have used this on my kid who has a problem with pot. I know he smoked a day or two before I tested him, but there was a faint line. The faq says that even a faint line is a negative. Was not accurate in this case.
negative