> Some people stopped buying pseudoephedrine entirely, either because they were offended by these rules or because they were afraid that they could wrongly be implicated in meth investigations if they appeared to buy it too often.
This has actually happened [0], and I seem to remember more instances (at least when the law was first passed). I know I have also gone to buy it in a headache-induced fog and found that I've forgotten my ID, and on at least one occasion the national drug whatever system was down and they refused to sell it. Because it has to be run through the specific national database, it has to be run through one department and I have been unable to purchase because that department has closed for the day.
These are just what comes to mind when I think about purchasing pseudoephedrine over the years; it's just generally become a pain to get. It makes me wonder if it'd be quicker and easier to just buy meth and reintroduce the hydroxyl group to get my cold medicine.
[0] https://reason.com/2009/09/28/hoosier-grandmother-arrested-f...