...SongDog...sad, but true.
Every year, there will be someone in this area that gets a ticket for having a turkey caller in his possession while carrying a firearm or bow, except during turkey season. And then, they had best have the correct permit.
As you said, "Guilty until proven innocent."
Of course, you can go to court, miss a couple of days of work, maybe hire a lawyer, and still lose!!! To add insult to unjury, you may have to pay court costs.
Or,... you can pay a $50 fine, a few bucks court costs, and go on your way. (which is what most guys do).
My son and I get checked, usually in the Spring, near the last of coyote season. A time or two, it has been difficult to convince the CA that coyotes is what we were trying to call. Even though we had 3 or 4 calls and a howler each, they still frisked us, and looked inside our hatbands, side pockets, etc., trying to find any kind of turkey caller.
I realize their reasons, but not everybody is a poacher. We have a few "pre-season hunters" who try to get a jump on the turkey season, as soon as the turkeys start gobbling.
Anyhow, that's how it is, here in southern Missouri.
Someday, I'm going to ask the agent about a diaphragm caller for predators, just to hear his answer. Should be interesting.