LEO's and more specifically WCO's aren't the morons many make them out to be...
First, I would venture to guess most people specifically targeting dace, chub, sucker & fallfish (I happen to be one of them) do so from the bank with the most effective tackle which most often is not fly gear and we/I most often fish bait.
Second, I doubt any self respecting, PFBC loathing, stocked trout hating, wild trout snob would ever lower themselves to using bait or those tactics while fishing for "gemmies" just to attempt to circumvent the "trout stamp" requirement...
Nope! Nada! No! Never, ever, ever....!!!
So in the real world...
A WCO comes up on an angler using a fly rod. This angler is fishing with flies and wearing fancy breathable waders (that probably leak becuse they are Simms). He is festooned with the latest tactical sling pack casting a fly rod, reel & line that cost 6 times more than the outfit the real sucker fisherman downstream is using...
And even for a millisecond, this WCO believes this angler is fishing for dace, chub, sucker & fallfish and NOT trout...
Nope! Nada! No! Never, ever, ever....!!! 🙂