+1 This isn't a police action to prevent dirty immigrants from getting across the border, it's a quarantine measure. 99% of those travelers aren't going to ro

+1 This isn't a police action to prevent dirty immigrants from getting across the border, it's a quarantine measure. 99% of those travelers aren't going to row across a lake to get into Canada; if they are chances are they're doing something sketchy and would have been rowing across lakes anyway regardless of the enforcement regime. More importantly disease transmission is one of herds and numbers -- a tiny handful getting across isn't a huge deal, it's the influx coming through ports and via plane.