Re: Kaboom
That's probably the most easy answer since there's no money for development costs. The only problem is the "shooting down". Most prisons in the States these days don't have high walls nor the staff to fully patrol the fence line. You definitely don't want someone with a shotgun (goose gun, maybe?) inside the fence line. Since the prisons are designed to keep the prisoners in and generally not to keep things out, it's a problem. More staff.. full-time... three shifts with night googles... one guard every (back of the napkin calculation...) 200 yards or so?
The problem is detection. These things are so small and fast.