Many believe we should use modern technology to prevent International Terrorists from disruption our transportation system. Most do not feel this idea is so radical as a matter of fact I myself have been thinking here and so have consultants interviewed in the media. We recently had attacks in London on the Tube, a day after the city won the rights to host the 2012 Olympics and during the G-8 Summit, which appeared to be a political statement as well. So this is obviously the dirty deeds of International Terrorists. So if we had better surveillance and some sort of real language voice recognition system and scanning tools for all electronic communication, we might have prevented it?

In the United States two large attacks have been prevented. Now the International Terrorists have plots to take out the NY Subway. So if we have the technology to use to prevent these things then that would be nice wouldn't it? Problem is only with privacy and we know from history we cannot trust those humans in charge of the information. We know that the FBI has leaked sensitive information to foreign spies and we have those amongst us who will use the information in the wrong way. But could we have enough sensors which are not monitored or collect information other than is necessary and only convey that information by warning? With SmartDust, networked sensors, MEMS, etc. we can do even better in the "all seeing eye" concept than ever thought. We have technology now to put a VLA scenario on the moon or on high altitude balloons to listen to every world conversation and even of bandwidth ability to collect it wirelessly and store the daily terabytes of information. I am not against collection of the data in itself only the use of it, as you are also worried about. For instance if someone murders someone or abducts a child or something like this, then the information needs to be passed on right? Some say no? But if it could be used in a positive way, then most Americans would not have a problem with it.

Problem is to total control it offers would be misused by man. Your idea is similar to that of many Sci-Fi writers. You should read: Time's Eye by Arthur C Clarke. There are other issues, which are a factor too. For instance remember Presidential Candidate from NH who had an emotional outburst of high energy during the election? Then they made a mockery of that on all the TV Stations? Well, someone in the crowd could have a Brain Wave manipulation device and cause such emotional outbursts anytime they wanted, then record it and alleviate the risk of competition from such a person in political endeavors at any level. School Board, Professors, Politicians, etc. You see? We are there now and since we are, we know humans are already abusing it. I am sure of it. After all if a group of guys wanted many women, they would go to where women are and cause them to be in a mood for extra curricular activities. We are currently using these abilities in the military, so this is available now.

America, we need to make some choices as all this technology is now available and deployable and some is being deployed, so think on this.