One more question, is no line visible at all indicitive of when I will pass? i have read that those tests or go/no go. So, in other words, is it possible to fail today with completely no line, and then take it again tomorrow and pass?

I realize that this is hypothetical. Also, there are obviously some very intelligent people here who have done significant research on this area. Has anyone else read the National Drug Court Review regarding the Marijuana Detection Window by Paul Cary, and if so, what is your opinion of it? He seems to indicate that even in chronic users, detection above the 50mg/l level after 30 days indicates new or continued use. There are alot of people on here who are coming up dirty from 90 to even 150 days after stopping. So, I guess what I am asking is, are people not being truthful about their abstinence, or is Cary just flat out wrong?