It actually goes further than bird feeders here. Any food stuffs placed for the sole purpose of attracting wild life is off limits for depredation control. The reasoning behind it is that if you so choose to feed wildlife, you can't choose the wildlife that dines there.

I can't legally do anything for squirrels stealing bird feed, coons robbing deers corn piles or possums eating honey buns set out to feed the bears. Fact is that feeding bears will get you a ticket right by itself.

We can't even field dress a deer here with out running the danger of getting a ticket for littering!

We've still got some pretty screwed up laws where wildlife is concerned. But we're working on them.

That's the main reason I won't take those kind of jobs. I tend to agree that if your dumb enough to lay out a sqirrel buffet then deal with it. I'd rather work with a client that can see reason when I explain they they have created the problem and are willing to change their ways so I don't keep getting call backs.
The exception would be gardeners or orchard owners. To me that's right up my alley as a gardener and I see it more as protecting an investment.

x2 on pecans

I caught my nemesis squirrel in a cage trap by throwing in a pecan pie in it that went bad. It's squirrel crack.