A real stickler might get you for harassing fish, especially listed fish. If the fish strikes it wa responding to the fly, even a hookless one. You might be able to talk the Judge out of it but it could be a lot like DWB; you'll get stopped and thoroughly searched.

Like Nick said, go talk to the local enforcement guys. It may work if you get their ok and let them know when and where you'll be,

I do know that one time we were fishing for the agency and had some agents out looking for us... Communication and transparency are good things.