Why are you even testing yourself after taking one or two puffs? You're FOR SURE going to test positive, so it's a pretty redundant endeavor.

Do both brands have the same cut off value ? Are you sure of the expiry date of both ? Lightness of the line HAS NO RELATION TO ANYTHING. Faint line, thick line, kinda-thick line, kinda-not-so-thick line, kinda-faint line...whatever, it all means the exact same thing.
SlinkyDinky Reviewed by SlinkyDinky on . Different test different results I have used several brands of THC strip tests. On one recent batch the second line is very faint even when testing a known negative and even tap water while another brand test used at the same time has a nice bold line. The test with the very faint line seems to be very sensitive to even the slightest amount of THC. After getting repeated negative results, then taking as little as one or tow puffs - the line becomes almost invisible. At the same time the other brand shows a clear second line. Rating: 5