The aren't going to fire a varmint rifle into the air in a populated area. They might want retrive these to get fingerprints or DNA samples, so they could chase

The aren't going to fire a varmint rifle into the air in a populated area. They might want retrive these to get fingerprints or DNA samples, so they could chase down whoever put it there (and the MPAA / power companies might lobby for them to make this a priority), but I doubt they'll do anything dangerous simply to take down the devices.