Quote Originally Posted by drewdog428
How is it possible that i would pass a drug test with a pretty solid line for THC yesterday and then i take another this morning and i failed it with a very very faint line

:wtf:
Even straight water can give a faint line. Immunassay is a very imperfect test which is why if there's a question it gets sent to GC/MS.
And thc levels naturally vary from day to day due to alot of different factors. Thats why its important that even if you test clean its a good idea to atleast do a mild dillution the morning of the UA.