I just froze some and used it for a piss test. I put it in a 3 oz. travel shampoo container I got from walmart. Then froze it I thawed it out by putting the bottle in the shower with me. My bottle was tight so no water or soap got in. At first the shit had white flakes and black specs in it. I put it under my ballsack and took a nap lol. I woke up and shook it up and it was fine looked like fresh piss. It was uncomfortable walking around with but I passed the piss test. I used the bottle that has a flip top nozzle so I could hide it.
They had a temp sensor it was black turned green when I out the piss in, I sacked it for at least 3 hours while I was sleeping. I had to wait in the waiting room like 5 minutes too.