This reminds me of a couple blackjack traitors that I don't even know their names. In my first few years in Vegas, there was a male-female team of "counter-catchers" working downtown. I am not sure exactly who they worked for, maybe multiple casinos, maybe some sort of collaboration. You would see the from the Plaza all the way to El Cortez, and various places in between (golden Nugget, The D ect). Word was they were a husband and wife team of failed card counters turned traitors.
They would wonder around watching games and players and next thing you know you were getting the tap. They weren't very discreate and easy to spot. I quickly learned to just move on when I spotted them. And then they disappeared. Hopefully they were at the Harvest music Festival in 2017 (LV mass shooting) or came to some equally as hideous end.
