how you doing growrebel.. I'm in the same position as yourself with the random testing.. Need on the spot pee, For the previous few years i have used something called clear choice with a chemical heat activator something the same as you have previously described....

I have now changed to QF V4 after coming on here and hearing everyone blasting on about QF, so my clear choice expired @ crimbo and i mad the move.. I have put up a few post asking fellow dodgers if they have heard of the same sort of product only got 1 reply i think... If you do a search with my screen name something may come up..

The only thing i wasw para about was adding the heat activator.. Didn't know if they could detect it or what, luckly i have never used it in anger..

O ye the shelf life for it was 2 years..