If you want to sell pseudoephedrine, your org has to "self certify", keep a logbook purchasers have to sign, require ID, enforce the purchase limits, train employees, etc. But, the logbook doesn't go anywhere unless some investigation or audit prompts that. So, if you're a really determined cooker, you can still go to a bunch of different stores...though you're leaving a paper trail. And some big brands might cross-check and have an org-wide electronic log book.
IIRC, its reported to a centralized state database in (near) realtime in some states, but in any case it is definitely the case that chain pharmacies generally have their own electronic tracking and flagging to avoid getting nailed the way CVS did [0], which may be shared systems like MethCheck [1], which can also be used by independent pharmacies.
So, you’ve got to choose your targets carefully for your “shop at lots of different pharmacies” plan.
[0] https://www.justice.gov/archive/usao/cac/Pressroom/pr2010/14...
https://help.eaglesoa.com/29/en-n-eagle/Pharmacy/Pseudoephed...
Anecdotally, I usually by psuedophredrine at CVS. I bought some in Orlando and tried to buy more at a completely unrelated store in Puerto Rico and was denied.
Isn't meth a lot easier to come by these days? I have to imagine it's more convenient to cook street meth back into Sudafed to fix your stuffy nose than it is to cook Sudafed into meth to get your fix.
https://improbable.com/airchives/paperair/volume19/v19i3/Pse...
Maybe, but more people are willing to do felonies to get/sell meth than to do the same thing for pseudoephedrine, and its just as illegal to by meth to cook pseudoephedrine as to cook meth from pseudoephedrine.
I'm apparently wrong about that. Seems NPLEX/MethCheck was made a requirement US state by US state over a number of years. So there's no national monitoring, but many (most?) US states require it and give law enforcement access. And like most things set up that way, enforcement and monitoring varies by state/county/etc.
Based on a few comments here, having it behind the counter is apparently pretty much just a waste of time, with meth production having moved to some other synthesis.