Hopefully this will generate some serious discussion since this is an almost uncontrollable part of OPSEC by the customer
With the recent article about the man who got busted trying to buy explosives...well, literally everything on the markets are illegal. Do you take any precautions or steps to prevent/limit LE from signing up as a vendor and busting anyone who pays them and provides a name and a shipping address?
tag any other active market reps!
You ask every potential vendor if they're a cop. Cops are legally obligated to tell you they're a cop if someone asks.