To the best of my knowledge SR is the only drug trading community currently around with an escrow system, however I do not keep up with private scene forums anymore. It may not be very hard for LE to reach in that they could easily obtain a presence, but it would restrict the number of participating accounts they could obtain. One of the biggest advantages I see in private forums is merely decentralization. If SR is taken off line right now it will be a tremendous set back and a lot of people will lose touch. If there are a hundred private forums to fall back on, SR still works great for the public market, but if it is compromised the overall damage done will be minimized and regrouping will be a quicker process. Don't take my posts to mean that I think SR should break apart into a bunch of private forums, I just think we need to address issues of nym flooding, redundancy, decentralization and add more cost to obtaining participating nodes (not necessarily financial cost either). In most cases they do a CD if they don't send a love letter, however sometimes they do a knock and talk.