How can I test the % of THC?

[ZeldaG.]

i swear i have seen a thc tester which you pee on, lol smoke than pee on it,

now thinking about it may just be o see if you got thc in you at all or not but i said somehting about the screen showing % xant memebr long time ago in camden town

ZeldaG. Reviewed by ZeldaG. on 01-08-2007. How can I test the % of THC? is there a test of some kind to check the % of THC in my buds? Rating: 5