The early ’70s were rambunctious times. That is when a folk rock duo, Brewer and Shipley, had their one and only hit song, a folksy little tune named “One Toke Over the Line.” It is a song about excess — about going a little too far.The song came to mind recently when I read a case from the 8th U.S. Circuit Court of Appeals, Gerlich v. Leath (2017). The named defendant, Steven Leath, is the president of Iowa State University. The named plaintiff, Paul Gerlich, is president of the ISU chapter of the …