they say it is about 3 weeks....the tests are pretty precise and they recently raised the baseline to trigger a positive to eliminate the idea of second hand smoke....they went from 15 nanograms of THC to 35 nanograms...for comparison MLB's is 50 and the Olympics is 150
They also take an A and B sample....if the A sample is above 35 then the B is also tested....Ricky Williams actually failed a a test where the A sample was 15.4 and the B was 14.8..if they had been labeled differently then he would have passed
If a player fails a test he goes to Stage 2....if he stays clean for 90 days nothing happens and he goes back to out of the program(tested once a year from 4.20 to 8.9).........if he fails a test in Stage 2 then it is a 2 game fine and then a 4 game fine.....they also move to Stage 3.....they stay in Stage 3 with completely random tests for 2 years...if you test clean for 2 years you leave the program and go back to Stage 1
http://www.usatoday.com/story/sport...all-league-marijuana-testing-policy/17784021/