But damn, consider the potential lulz. If someone intentionally contaminated the postal system with fentanyl, an appreciable percentage of all packages might show up positive. I vaguely recall that this accidentally happened during the 2003 ricin attacks. One of the letters got ripped in machinery.

Fentanyl is very dangerous to handle. It wouldn't be "lulz" at all.

Well, if their plan is detecting opioid residues on the outsides of packages, they must be aiming for at least nanogram detection limits. Because they're counting on sloppiness in weighing and packaging. And those levels are far below toxicity thresholds, even for fentanyl.

Here's a fatal dose of fentanyl. It's 2mg.

https://www.drugabuse.gov/about-nida/noras-blog/2018/05/true...

Thats a "weaponizeable chemical" kind of scary. I mean, imagine if a dealer dumped something of this into the airduct of a public building or train station to get more customers...

That wouldn't get more customers it would just cause people to get high, sick, or dead. It's not like they would put a big calling card "like how you feel call this number"