Possibly what they are doing is landing fish for which the season is open in Washington, and the anglers they are guiding have purchased licenses in both countries. For example, blackmouth season is open most of the year in Canada for two fish, but only a few months in Washington for one. If you land one fish in Washington on the right day, and have licenses to fish in both places, then what can they do? But if blackmouth fishing is closed in WA but open in Canada and you land one here, you have broken the law. But not if you drove your boat over the border, launched it there and fished with a Canadian license, landed the fish over there and processed it so that it complied with Canada rules, put it in your rig, and drove home, that's legal. Anyway, read the regs, they are always clear and make perfect sense