If you put chlortetracycline powder in your farm animals’ drinking water to prevent disease, please be aware that a new federal rule now allows you to buy a generic version of the powder if you wish.

Actually, I probably shouldn’t be calling that rule a “rule.” As the new rule states:

This rule does not meet the definition of ‘‘rule’’ in 5 U.S.C. 804(3)(A) because it is a rule of ‘‘particular applicability.’’

Despite the rule being called a rule twice in one sentence, it really isn’t a rule. Probably best to let logicians sort that one out.