DAVID KOPEL: Brown v. Buhman isn’t so complicated. “It is important to remember Brown v. Burnham in no way establishes a constitutional right to plural marriage. Nor does the Brown decision challenge ordinary state laws against adultery. Rather, the decision simply strikes down an unique state law which defined cohabitation as ‘bigamy.’ Even then, the statute might have been upheld but for the government’s policy of reserving prosecutions solely for cohabitators who for religious reasons considered themselves to be married to each other under God’s laws, and who fully conceded that they were not married under the civil law of the state.”