There have been times when I was using a flyrod flatfish or a #00 spinner wtih a treble hook that I knew I was fishing a lure just as I know I am fishing a fly when I tie on an adams or a fox squirrel nymph. Unless I'm fishing flies only water I don't worry too much about the things on the borderline. I understand that C.O.s on the Pere Marquette at one time were calling a Clouser minnow a jig. I don't know if they still are but it seems to be accepted as a fly by most people these days. Similarly some of the flies being made with dremel tools seem very similar to the flyrod flatfish. I'm not sure why they wouldn't be a fly if the surface bugs made from the same material are. Does it become a fly if I add a long tail and call it a floater/diver? Or if I spin deer hair and trim it to the same shape? if it's the presence of the dangling treble hooks that makes a lure rather than a fly then tube flies become lures. I guess I'll just fish what I like tying or fishing wherever it's legal.