A test can be conducted as "directed" - there is no set number of times it can be directed - he could be directed to test at the last meeting. I always suggest that after a test by a state agency or employer that the person then seek their own test - at a clinic - this cost money, of course, but it does give back up in case a test comes back positive. Also, no one will care how the positive came about (ie. Someone put something in food, drink, etc) they are only going to care that it came back as such.
Again, get information on a clinic that he can immediately go to after test with PO and have one done as a back up - this would be the only way to show that there is a discrepency.
Best of success to you and him in the future,
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