If it makes any difference, I deem it successful...far too successful....
The only way to hunt and kill a sniper is with another sniper. However, this dude(s) obviously know that, and are refusing to fall into any sort of pattern that we can use to track him/them. Shoot, nobody even knows for sure if there is one, two or twenty.
The only way to defend against this sort of thing is to hand out Kevlar vests and cut down ALL the trees...home-schooling may soon become the norm...and telecommuting...
Personally, there is one weapon that I have found to be effective in this sort of thing...intercessory prayer...but for some reason God hasn't taken these guys out yet...
One thing for sure, this time next year, you won't be able to buy a BB gun...hello New World Order.