Free: Contests & Raffles.
USDA preditor control would be my guess. - sorry you still have to sit on the frozen ground and call them one at a time
I'm very sorry to hear your honey hole is getting arial pressure, that's a bummer for you. If it was me I would try to find another good area, there are plenty of yotes in WA.I can't imagine the guy would openly tell you about it if it was illegal. If legal I think it's great they are thinning them out, send them up to Stevens County. Almost forgot, I agree, get him on your team....
if your curious, contact the game dept. I thought it was a no no also, Im a pilot and have had people ask me to do this and I turned them down.
The land I hunt in Yakima gets flown every late winter before the calves drop. Perfectly legal!! I call the land owner before I make the drive from the west side. Been going on for years. Its pretty cool to watch, It totally screws the hunting, but the farmers save allot of calves.