A faint line is still a negative and, contrary to popular belief, serves as no indicator of THCA levels in the urine. Even synthetic urines (which contain no drug metabolites at all) can produce a faint line on an assay.

But as Deige stated, take one more test this time using the first urination of the day when the THCA concentration would be at its highest (aka; "the worst-case scenario"). If you test negative under that "worst-case scenario", youre good to go. :thumbsup: