i am using my buddies urine who is clean and he is pissing in a shampoo bottle which I will crotch in to Labcorp, my main question is that if he pisses in it and 30 min later gives it to me, and I crotch it to go to take the test, will the temp drop a lot in the 30 min or would I be good with the body heat once I get it....or should i give him hand warmers to put on it till it gets to me? everything in here is about fake pee, just wondering if real pee cools quicker