[Miss Marple]

What are you going to do about US citizens who leave the country, hook up with al Qaeda, and then return? I have given examples of this in replies above. How do you suggest this be prevented?

[StriperSniper]

You are right about those possibilities. Nets have different mesh sizes to diferentiate what they catch. As I said, I would accept some additional risk to keep the "mesh size" from getting down to the polce state level, which I think we are fast approaching.