Quote Originally Posted by FakeBoobsRule
Some of those heat packs are too strong. I find they are really only useful when you need to heat your sample up more quickly than with body heat alone. Practice with body heat alone and I'm sure you will be surprised at how much heat your body gives off.

Your prescriptions will not cause false positives.
When looking at heat pads the BEST is the ones for the feet (to be put in work boots and such) made by heatmax-they only get to 104. Or the ones that get be directly applied to skin, these also have a good temp.