What I have been wondering about is a positive line showing up after 3 hours. I've had this happen consistently, and found no indication of what to do. The offi

What I have been wondering about is a positive line showing up after 3 hours. I've had this happen consistently, and found no indication of what to do. The official docs say any results after 30 minutes are void. But why? Does the false positive rate go up to high? What could cause false positives. I have had a few PCRs that all said negative, but the quicktest really worried me.