Well I think I'm just going to use two packs on them, and then before I get there pull aside and check the temp and the heat packs themselves and if they are a bit cool, just change them out. So I'll have a few.

Just wondering if it is reliable to begin with when it was over an hour from when the synthetic urine is microwaved. What experience have you guys had? I don't have to worry about it being sent to a lab, they do the testing onsite right in front of me as soon as I give it to them in a 5 panel screen.