You're right about written permission but if I was in his position (and not a lying poacher), I would make sure written permission was in my hand. And according to IDFG, it is the hunter/angler's responsibility to know when he is on private.You don’t have to have written permission, it says you should get written permission or another form of permission. Also even if the landowner gives written permission they may revoke that permission at any time, so to me verbal permission is good enough
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“Trespass laws have changed, but the core philosophies have not,” said Idaho Fish and Game’s Enforcement Bureau Chief Greg Wooten. “It’s still the sportsman’s responsibility to know when they’re on private property and obtain permission to be there.”