Hanks you are wrong. It takes some people well over 30 days to get clean for a urine test. Because THC is fat soluble, there are a lot of factors in play as to how long it will take to get clean. I know plenty of chronic users who took almost 60 days to get clean. 30 days is not the maximum for a urine test. Most can pass after 30 days but not all. I also know of one person who took 105 days to get clean.
30 days is not the maximum detection time for a urine test. If you don't believe me do some research through the posts on this site. Just in this one thread I am posting below you can find people that failed after 30 days.
http://boards.cannabis.com/showthread.php?t=76993