NORML should stick to legalization efforts. Their drug testing info is not always correct. Some people can be clean in just a few days, others may take 60 days to get clean. THC half life elimination varies greatly from person to person. It can range from 0.8 days to 10 days. Obviously your smoking history is also important (how much, how often, how long, quality, etc) as well as body type and activity level. best thing, get a home test.