people with personal use amounts normally have dragnet operations aimed against them, not targeted investigations. So for example, an interception of a small order is what will get you in prison (targets people who get drugs via mail), more so than the feds identifying you are a small buyer on SR and then trying to actually find you (targets YOU getting drugs via the mail). But the distinction between targeted and dragnet can get kind of thin. What if FBI find a way to deanonymize all Tor users? Then their dragnet operation against 'people who use darkent for drug trafficking' is going to do a pretty good job of targeting 'you'.