Let he who have not played within city limits from time to time cast the first indicting comment...
I can count at least 2 fields I go to from time to time that are almost certainly within some city limits, both of which the O.P.P and/or local police are aware of, and in the one case actually regularly stop by to check if everything is running smoothly.
In both cases the field owners proactively reached out to local authorities and keep a regular communication channel open.
That, and they talked to their neighbors.
Now you know