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Safest thing to do is buy a couple of testing kits and a bottle of Quick Fix then you have both options available to you - the natural way and the QF way if you need it on the day. Test yourself 24 hours before the test and if you fail go to the QF.
You can crotch the QF easily....get yourself a pair of tight (flyless is best...don't want it escaping accidently) boxer shorts... a size or two too small works for me. I am assumimg you are male here. The just put the bottle between your legs under your b*lls.
Microwave the bottle on high for 10 secs before you do and it will reach about 92-94 degrees. Put the bottle in place and keep it there for an hour (sitting down or driving is good) and I promise you it will be at the right temp when you need it. Just make sure it stays well in contact with your body at all times. As long as you wear loose pants and don't let it slide out of place you'll find it's pretty easy to jeep it where you need it without anyone knowing it's there. QF also comes with a squirt type spare cap so you can pretty much just pull it part way out of your underwear and fill the cup by squeezing.
I did a trial run with an old 2 oz shampoo bottle filled with water the other day.
Microwaved for 10 secs it was at 92.7 deg.
Shoved it in place, drove for an hour and a half to a business meeting, stopped at a gas station just before I went to the meeting, and the temp was at 97.2 deg. Perfect!
For the cost of a digital thermometer (about $8) a bottle of QF and a testing kit ($40) you can be 99.9% certain of passing and have done a trial run or two to be sure you know what you are doing. Pretty minimal investment when you think if it in terms of the cost of your herb and not having a job!
Thanks for the help. But I am just concerned about the physical part. Doesn't a physical usually require me to pull down my shorts, turn my head to the side and cough?
How can I pull them down when I have a bottle of fake piss in there, ya know?