The main supplier of illegal drugs is the intelligence apparatus. The Mexican cartels are their allies. That's how (1) the US doesn't care about lawlessness in Mexico while it invades Afghanistan, and (2) the cartels conveniently keep their dirty business south of the border.

It's easy for them to spike their own illegal drug supply, and there's little chance of being found out, so this is the obvious thing to do.

Of course, now they spiked the mother of all vaccination campaigns with the Covid vaccine mandates.