In my opinion, it's no more plausible than any other drug or profession. Nothing is difficult to come by.
Agreed, but easier to acquire in some walks of life than others?
When I was in a band in my younger years the illicit substances were plentiful subsidy. You didn't even need to ask; they just appeared, as if by magic.
When I worked at a higher end retail business a few years later, I don't think ANY customers tried to subsidize that pitiful income with substances, and they were a MUCH more difficult audience.
So yeah, things can "be gotten" about everywhere, it's just that some occupations tend to run a person closer to a diversity of opportunities, which might be relevant here?
Could we agree it's less of a leap to ask someone to acquire something they'll run into incidentally versus asking someone to go make a buy when it's not a transaction they're used to making?
One which can also be dangerous, depending on the seller and their degree of paranoia about this newbie trying to Venmo "some of that really dangerous opioid, what's its name? The f-stuff that kills a lot of people? Is there tax on that or is it just the $100?" (Awkward transaction as imagined by me, not quoting anything that actually happened).
All that stated, it seems like an exponentially stupid way to kill someone, but then again, nothing about this case was especially clever.
Buying drugs introduces at least one more witness into the pipeline, and at that, someone who might have less of a problem snitching out a murder-oriented buyer should they encounter their own legal issues.
Also Fentanyl seems extremely risky as an intentional poison?
Street drugs and street-acquired pharmaceuticals often come with other ingredients that also leave a questionable trail. I read a DEA report several years ago that listed what was being recovered/found in various cities off the streets. Plenty of counterfeit pharmaceuticals and plenty of altered illicit substances. Seems pretty risky to acquire and use those when you don't know for sure what you're getting?