I was wrong about the law in Oklahoma not being standardized. Apparently, the limit to how much sudafed one can possess is set in grams, and retailers set policies for how many boxes they sell at a time based on that information. Here is a quote I pulled from a DEA website:

House Bill 2316 passed both the Oklahoma House and Senate in May 2002 and went in to effect on July 1, 2002. This new law puts a 24 gram limit on all cold medicines containing pseudoephedrine or ephedrine. The charge carries a five year maximum sentence. If a retailer knowlingly distributes pseudoephedrine, ephedrine, or phenylpropanolamine with the knowledge that it will be used to manufacture methamphetamine, the sentence carries a maximum of ten years incarceration.

This information doesn’t change my feelings about the law. A person can still purchase more of the over-the-counter medication than the law allows by skirting the policies of retailers. I just wanted to correct my original blog with accurate information.