Quote Originally Posted by Purple Banana
I'm pretty sure that wouldn't work... Bleach is naturally very high on the pH scale, around 10,12-ish. Urine is about 4,5. The bleach would deactivate the urea in the urine, and make the urine much more basic than acidic- something they do test for, so it would come off as tampered.

Otherwords, NOT a good idea.
Which is why you only put very little in it.

When I have heard of this trick being done, people said they've dipped their fingers in bleach, then pissed over their fingers into the cup. That would be a very small amount of bleach and might not fuck with the pH level.

Are you sure they test pH? Cause I've heard they ONLY test for drugs, theres no test to see who it belongs to or nothing else, just that it IS urine and whether or not there is drug metabolites in it.