yup. i've seen snaggers come in all forms.
i was mistaken for a plain clothes CO before when i encountered them. i just happened to be passing by at a not so popular spot but a spot that held fish nonetheless. i parked and wanted to take a quick look at the water level and clarity and i saw three guys in their 20s with all the bells and whistles including neoprene waders. i was at a distance and saw what was happening.
i continued walking to that spot in my regular clothes with no gear on me because i still wanted to have a look see. as soon as they noticed me come around the path all 3 of them stopped everything completely. took their lines out of the water and basically pretended that they needed to change tackle, etc and were acting very awkwardly. i could tell that they kept looking at me from the corners of their eyes wondering if i was going to do something and couldn't wait for me to leave.
i also got the feeling that they didn't have licences either.
I am not a snagger, but I do that all the time when someone happen to walk up to a spot I'm fishing. I may have found something at that spot which I wish to hide that information from you. I may have found a fresh pod of steelhead or browns...and I certainly don't want some Joe Blow watch me catch one, and then come sliding in next to me because they've just seen someone landed a fish. That type of sheep behaviour happens too often...and I've now learned to protect myself against it.
No, I'm not trying to hide any illegal fishing methods...I just don't want company...and I don't want hordes of people scaring the fish I just found with a lot of footwork if they flog the water or pop their floats at the end of every frigging drift.
I had even intentionally cast into dead water to drift for nothing in particular while someone stand there to watch me. It's okay...I've got all day. I'm not going anywhere...and if I drift the dead waters, you'll see me catch nothing. You can keep watching until the cows come home...I'll reveal nothing. Nothing is going on and there is nothing to see. Most of the time, people move on. I'm giving the fish a break while drifting dead waters. So it's a win-win for me most of the time.
So no...sometimes those people who look suspicious are legit...they just have other secrets to hide.