Blood Drug Testing

If I give my son 2 at home drug tests, the first is negative, and the second is positive?

What do I do? The first one was a faint pink line, the test says that is in no way a positive, and actually a guaranteed negative. The second test, which used a strip, says positive?

Public Comments

1. instead of using two different tests, get two of the same tests and retest tomorrow. if he's been using, it won't go away by tomorrow.
2. buy a new test. is it possible that he has used drugs after the first test but before the second?