If you are going to freeze urine for future use it has to be kept in an air tight container. Otherwise particals in the urine break down due to getting frost bite. Once frozen in air tight container it will keep in freezer for about a year and a half.

EDIT: I used frozen samples (my own clean stuff) for a whole year and they all passed lab test.
KNOTME66 Reviewed by KNOTME66 on . Piss Ice Cubes? I know, what the fuck? I don't claim to be the first person to come up with this, but I've never heard of it before. Get clean, naturally, piss in a cup (as may times as you want) and freeze your clean piss in an ice cube tray. Put a label on the bad boy (hopefully saying "DO NOT CONSUME") and have clean piss whenever you need it. This is probably more effective for girls. Thaw a couple cubes, heat em up for about 15 seconds once thawed (I've nuked piss before, it's fine) and put them in Rating: 5