"Michael" wrote in message \

This won't actually work if the person has enough
of the drug in his system to be actively impaired or if he has a very
high concentration due to chronic use, but it works pretty reliably if
the person is only an occasional user who has been clean for a couple
of days or more. Why we should care that the person is an occasional
user who last used days ago has never been adequately explained.

A probation officer I know who administers drug tests to, eh, "clients,"
says the test for MJ will show clean after only about three to five days if
it's a rare or occasional users. Habitual users can be detected longer than
a month after they quit.

Most POs aren't looking for pot, though, and aren't so concerned if the
client inhaled two weeks ago although a probation/parole violation is a
violation. They're usually looking for opiates and amphetamine.

-c