So you pay with monero but you still need to give them an address to ship to which some probably store somewhere where the police might eventually find it ?
I guess depending on the local police the chances of that leading to any trouble are lower than getting stabbed by a tweaker when you go out into the community to purchase your stuff
The risk is not just 'stabbed by a tweaker' but 'surprise fentanyl'. And police are very unlikely to come after some random online buyer who is not distributing/reselling.
If your sample is cross contaminated with fentanyl e.g. from a scale there is a chance the portion of the sample you sent for testing doesn’t have any fentanyl. These aren’t homogeneously mixed substances its someone loading a dime bag in a bedroom.
I've heard that drug abusers exploit legally protected status of snail mail to avoid search, and have substances sent to an innocent third party as a dead drop or a dummy address to be intercepted. I'd assume authorities will get to you anyway, though.
If someone sends any comm without PGP or I heard a vendor they are not using it witb someone else and I'm never interacting again. It really is that simple!
It was dropped because they would have no luck proving anything. But if they had your credit card making the purchase, things would have turned out differently.
