Well, I haven't run or been around all the models mentioned here.
But a few comments..
Probably a good idea the detector is weatherproof or waterproof.
Also,,as far as crime scenes go,,,they are all not about just bullets and shell casings.
Smaller, medium and larger jewelry discovered at a crime scene,,,could be very significant in solving cases.
And other items as well.
Granted police depts do have budgets,,, and I would also maybe mention,,,it is not unusual to be able to rent a detector as needed-- do need a person who knows how to run though.
This for smaller towns might not work,,but larger cities it might.
And a police department could also buy a used detector-- ethics allowing.
Local police departments would do themselves justice by advertising in their local newspapers for outside help from the community on this matter also,,,granted I can see,,where allowing a civilian to enter a crime scene could be troublesome as far as chain of evidence goes and the crime scene's being challenged later in courts as not being sterile by allowing a civilian to enter and run a detector aiding law enforcement.
