I think most times it is someone having one as a hobby and having a curious look around, but for every new technology there will be someone who uses it for criminal activity.
I don't think I would worry too much about it; we have on occasion had one in our neighbourhood. If it happens more than the one time, you can report it to the local police.
What would you do if this was your cat?
Thomas Markle Snr. being investigated for child sexual abuse images.
The Government advice re emergency packs
