NASCAR has suspended driver Jeremy Mayfield for violating its substance abuse policy. ESPN’s Ed Hinton reports that “sources close to the situation said Mayfield claims he took Claritin D, an over-the-counter allergy drug that contains pseudoephedrine, a substance banned by most sports.” NASCAR does not have a list of banned substances. It punishes what it calls the abuse of any drug.

If you are a normal person who does not have to worry about the police finding your Riverside, Calif., meth lab, there is no reason for you to be aware of the competitive advantages of pseudoephedrine. We don’t know whether or not Mayfield took