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LOL so you're supposing their are a lot of drug dealers out there giving handouts to users? LOL Come on
"Drug dealers" doesn't even enter into it. You're basically trying to conclude that because Chemical X shows up in somebody's system, therefore they must have made a transaction. Nor, once again, has anyone defined what "drugs" even means. That's extremely vague, especially considering that some substances that are not drugs at all, e.g. cannabis, are commonly lumped under that term, while others that very much are "drugs" including prescription drugs, including alcohol, are not.
You do your due diligence looking for jobs on Monday. Monday night, a friend shares a joint. Friday you get popped with a test. Busted. Yet you met no "drug dealer" and you spent no money. Or you do somebody a favor, like give them a ride home, they lay a line of coke on you in thanks. Busted.
That's bullshit. No money changed hands. You don't bust somebody for bank robbery on the basis that, well the bank got robbed and this guy over here just spent a lot of money, therefore he must have robbed the bank.
Another guy cashes his SNAP and buys liquor and/or cigarettes. Eventually blows it all on that. No test.
That's bullshit.
And if you think actual drug dealers don't give handouts, you're very naïve. How do you think they create a customer base?