Besides what @uftaipan just stated, perjury is extremely tough to prove because prosecutors have to prove the accused had to know he was lying. The phrase “I don’t recall” or “I cannot remember” is often used in perjury cases for a reason. Legal scholars, expect for those on the very far left, have chimed in that trying to convict Kavanaugh of perjury would be a waste of time. There was nothing to investigate because no credible information was provided to the FBI of the accusation made by Dr. Ford. No time or place, no year, no witnesses named stated they never attended a party like Dr. Ford described. So what are they supposed to investigate?