A long time ago we went in from Beaverhouse when there was a fire ban.  You could use a gas stove but no fires.  It was great no bugs and the sun shined every day.  A week plus later we were paddling out on Quetico Lake and had stopped on a sand point.  As we were walking on the point, a plane landed and the ranger basically asked what the hell we were doing in the park as the park was closed.  We showed him our permit with our entry date so he didn't do anything, but he advised that we had to leave the park right away.  So if it gets dry enough, they will come and kick you out.
Westwood