I’m not interested in going head to head with the guys in the shiny shoes, so if you are looking for specific types of “proof”, you will have to find that yourself. As I suppose the only TRUE proof is witnessing firsthand. To answer Pokler, it really comes down to logistics. As I said, I wouldn't dare delve into nation state type activity, but as far as we are concerned, ask yourself... where did I buy that burner? Was it a big box store? Did the store have a camera? Burned... did I take it in my car with me to the hotel? Burned.. or did I try to be extra smart and take a train? How did I pay for that train fare? Cash, well done! Except for the cameras on the trains and at the stations. Or did I walk past that store that uses facial recognition? Burned.. as you work out every detail and possibility, you see how difficult it becomes.. Easiest way would be to monger for only the one day a year that I could wear a guy fox mask all day, sit on the subway with nothing in your pocket but cash, and not have any1 take a second glance at u. Happy Halloween.