Cornette explained everything several months ago on an episode of The Jim Cornette Experience podcast.
“The last time I went a few years ago for a Ring Of Honor show I’m driving with my wife Stacy and I’m driving in my own vehicle which is registered to me.” He said that got to the US/Canadian border and then was told to pull over to the side and his car was searched. They did not have any weapons, drugs or any other prohibited items but they decided to pull up Cornette’s legal history and stuff from the 1980’s came up including arrests for assault. He noted that he never spent a day in jail and was never sentenced to anything and explained, “I was a bad guy wrestler. I got a bunch of assaults and various things.” The authorities determined that he was not legally allowed to go into the country. Nevermind the fact that Cornette had been traveling to Canada for years and these issues were never raised.