That is BS. They are supposed to give you a sticker that you can place on the vessel once you have been pulled over for a safety check, that way they dont get you again for it. They got nothing better to do with their time.
Just an FYI, if you didnt already know. If you run on the US side of Bell Isle, from the Bell Isle Bridge, until the river opens into St. Clair, it is no wake. But you can go full bore on the Canadian side... As long as you don't anchor in CA waters, you can run in them all day long.