I know that real urine starts to breakdown after eight hours in the fridge don't know about freezing it I have had my dad pee for me and stored it overnight in the fridge and did'nt have any problems passed my ua with it. good luck hope this helps
joker88 Reviewed by joker88 on . Using real piss for sub method If I can't get and fake piss I'm forced to use my little bro's piss. I've done the substitution method before and got it down (Fuck my balls were on fire!) I know you can freeze the piss to make it last, my question is, how long will the piss last if I freeze it, then thaw it out? I'm pretty sure I'll be tested first thing in the morning. Rating: 5