i can verify KNOTME's post also...i have been using a bottle of pee for a little over a year for my unsupervised tests through my drug classes...ive used it 2 times in the last month and its still workin just fine for me


i would not suggest re-freezing a previously thawed sample though...like if u thaw it and dont end up needing to use it...toss it then re-thaw more from your "reserve" heh...