[quote=spdrun]How about counterfeit money coated in a slow acting contact poison? Or a potent hallucinogenic drug?[/quote]

My guess would be that they get rid of a lot of the money right away. Could be used for weapons, in which case the poison might be useful, but they might also be using the money to buy non-weapon goods and services in the open market. It wouldn’t be nice to poison the poor person who’s selling cucumbers and tomatoes at the market.