Not trying to sway anyone's opinions on this but i can clear up the issue a bit i imagine,
when a call comes in in relation to someone shooting 9/10 it will be a response unit sent not ARV unless there is a serious concern in relation to the type of weapon and where it is being used, there is an emphasis placed by ACPO that all items located without an OBVIOUS owner near by will be recovered to the nearest available station with facilities to hold it and kept for 28 days for an owner to come forward otherwise if some states that police have been down, had a look at it, then driven off and