Putting aside any racial concerns and implications thereof to profiling...Admittedly I'm no security expert but the proposition of profiling that your "guy on TV" put forth would be in actual practice rather ineffective, I would think. When profiling, a set of markers are constructed and then those makers are watched for. Someone wishing to pass security simply needs to know what those markers are and avoid them. If security is looking for young males then use old. If security is looking at people with small amounts of baggage bring lots of baggage etc., etc., etc. It seems to me, profiling is kinda paradoxical the more refined it is the more accurate and easier it is for the screener to implement but conversely it becomes easier for the "watched" to get around. While I don't completely discount profiling, it seems that it would be too easy to get around, to be on the starting line of defence anyway.Several years ago (10 or more), I believe I heard it on NPR and maybe 60 Minutes, state police and highway patrol departments in the southern states started using profiling to catch mules of drug traffickers. I don't remember them all, but some of the markers law enforcement officials were watching for were single occupant rented four door cars driving at or just below the speed limit and only on certain highways. While I know no statistics of just how effective the program was, I do remember one mule, turned snitch, laughing that while law enforcement caught his buddy in the rented Lincoln with a couple of kilos of coke, he sped by them in moving van with a ton of coke. Plus, as soon as the traffickers figured out what law enforcement was looking for they changed their appearance. The long and short of it was, as I remember, the program was effective only in the very short run but then would fail dramatically and need to be reassessed and resulted with constantly changing, overlapping and multiple profiles being issued to law enforcement. Thus, loosing any arguable effectiveness it had as a precision tool for law enforcement. When talking about dirty bombs and chemical attacks I don't think any method should be considered where dramatic failure has been a demonstrated outcome of previous implementations.Don't get me wrong, I think some bit of profiling has limited merit but its profound short comings must be recognized and addressed. My conjecture is that principal among these is the very human proclivity to look for the concrete rather than the abstract, especially when the fatigue and boredom of routine sets in. That is to say, if screeners and law enforcement are told to be on the lookout for certain markers, many of them by the end of their shift are more apt to be looking for the described markers rather than suspicious activities in general. I don't think that's so much the fault of the individual but just the prejudice (not meant in racial sense) of the human mind and how it works.While I'm not advocating complete amendment of profiling I think it should not be anywhere near the emphasis of a security system, which is what I read your "guy on TV" to be purposing.