Legamorons

Here is Arnold Kling on what he calls Legamorons which are laws not meant to be enforced.

many laws are the legal equivalent of oxymorons – legamorons, if you will. A legamoron is any law that could not stand up under widespread enforcement. Laws against marijuana use are a prime example. Rigorous enforcement of these laws on middle-class college campuses would cause a furor.