Frozen urine can last 1-2 years. Urine at room temp. can last 3-4 days before developing bacteria that can compramize the sample. Of course there are always things that can be taken into consideration; exposure to light, exposure to air, validity of the test ect. but the 3-4 days thing is safe.
stones Reviewed by stones on . is urine supposed to be frozen if i'm substituting? alright... so my school randomly tests me and my plan is to keep a bottle of piss that will be fresh as of every night in my backpack in case i get called in. if i do get called in, i already have it figured out to how i can get the temperature up in time and all that stuff, so im not worried about that. but i do have ONE concern: --i'm going to have a clean friend pee for me every night so i can bring it to school the next day. now, i've been told that it's detectable how old urine is... so Rating: 5