It was only a matter of time. You can go do things in one state that are illegal in another state; but they will be watching you do it, and looking for ways to punish you.
NEW: Police in Wisconsin used Flock to determine that a man “travels to Michigan frequently,” where marijuana is legal, then back to Wisconsin, where it is illegal. They then used his travel across state lines as tracked by Flock as part of the probable cause justification to search his car.