This should have been the standard from the start.
Test 'em all, let 'god' sort 'em out.
Nowadays, testing is pretty easy, and inexpensive. 'Portable' test kits can be had for a couple $$ (depending on the amount and variety of drugs being tested), and a half-dozen+ kits can be provided to and kept on hand by every case worker for a $20 bill.
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