dgfred
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In regards to marijuana levels, I don't know much about blood tests, but I know with urine tests it can depend on how heavy of a user a person is. If a person is a chronic user, the levels will be high and stay high, even if they don't use for a few days. If the person is an occasional smoker and only has a little, it can still stay in the urine for 3 days. Essentially, really high levels mean chronic user and/or just used. Lower levels mean that they are a chronic user who hasn't used in a while, or they are an occasional user.
Marijuana will stay in the system quite awhile... about a month. So it is possible she had smoked over the weekend, but the drinking is another deal altogether.