So I have a drug test tomorrow and im getting urine from a friend to use. I plan on getting the urine from him 45min before the test, so at 45min before the uruine is fresh and warm. Should I simply put it directly into crotch then and it will stay warm. or should I apply to crotch with a hand warmer on it? I think that my body heat will keep it at the right temperature but im not sure. Please get back to me asap.