Heads up??? anyone with half a brain knows better than to fly near border crossings, airports, military bases. What were you expecting?
Amazes me how some people, rather than protecting our hobby and keep these places out of their fly zones, continually push the boundries. In the end we will all end up paying for it.
Use your noggin, not rocket science on where and when to fly.
Not much the Detroit cops can do about your flying down at the riverfront or even by the bridge as they no authority from the FAA. As for Belle Isle I got the same response from the state park up here in Commerce Twp. In fact I did a video for them which they are using to send visitors to see what the park has to offer.