Hi,

I'm kind of a newbie, so take this with a grain of salt, but I have read in many forums (and the stickies on this one!), that these labs first use a stick just like the ones you purchase to see if there is a pos/neg. If they find pos, then they send it off for the fancy gas spectroscopy test.

So, these tests should be equivalent. When testing yourself, a good idea is use your early in the day pee so you can be more confident about your THC levels (passing an early in the day, non-diluted piss, only serves to give you more confidence about using a later-in-the-day, diluted, piss).