Comey knew what he was talking about all right. His stunning exoneration of Clinton, filled with duplicity and verbal razzle-dazzzle, will no doubt stand as a prime example of legal-weaselese for future students of law
As outlined in Comey's speech exonerating Hillary Clinton of any wrongdoing "Comey's Law" may be summarized as follows: "Unless one intends to break the law, then no law has in fact been broken...unless they are not, in which case they are."
That last bit refers to the fact that if one is not a Clinton then the first part of "Comey's Law" does not apply, and the individual in question is indeed guilty of breaking the law, whether they did it intentionally or not. (See "Exhibit A" former US Navy sailor Kristian Saucier).