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NB is, as usual, all wrong, as is the guy in the story.
The entire point of statistical random screening is driven by 4th Amendment law in this area.
In a nutshell, the 4th Amendment requires probable cause.
However, courts have permitted certain kinds of searches on "reasonable suspicion", such as a Terry stop. If you are running down the street a block away from a bank robbery, a cop doesn't have probable cause, but can stop briefly on suspicion, and limited to purposes for dispelling that suspicion. Incident to that stop, a cop can frisk you to ensure you have no weapons, for his/her safety during the brief stop.
Okay, with me so far? There are kinds of searches on "probable cause" and searches on "reasonable suspicion".
There is AN ENTIRELY DIFFERENT CATEGORY OF THINGS WHICH ARE A SEARCH, AND PERMITTED AS LONG AS CERTAIN RULES ARE FOLLOWED.
This category is the "administrative search" or "suspicionless search". It grew out of cases where there was a recognized administrative need to keep weapons off of planes, and drunk drivers off of roads, under which EVERYONE is subject to search without any cause or suspicion whatsoever.
The key point is that EVERYONE is subject to it under the context in which it is being conducted.
At a sobriety checkpoint, for example, what happened was that cops started pulling over cars on hunches. That made the searches illegal, because they were not based on either probable cause or a reasonable, articulable suspicion. The rule that evolved was, essentially:
1. You can search everyone to the extent necessary in relation to the reason (weapons, drunks, whatever)
2. You can search every Nth person
3. You can search X% chosen by a random process
4. You can search anyone for whom you would have a reasonable, particular, suspicion (e.g. car with missing tail light)
The cop in the story, and the poster above, are completely wrong about there being some kind of "exception" to the 4th Amendment. The 4th Amendment, as interpreted by the case law on this point, REQUIRES SUSPICIONLESS SEARCHING NOT TO BE BASED ON TARGETED FACTORS.
So, this guy, demanding "probable cause" is an idiot who does not know 4th Amendment law in this area.
What some people are proposing - e.g. profiling factors - is actually an erosion of the 4th Amendment, because what they want to do is to permit individually targeted searches on LESS than any standard which has been applied to individual searches.
Arguments about what is "practical" or "effective" don't enter into the question. The current policy, in terms of who is selected, is dictated by a long line of court decisions.
The real question here is whether the TSA can justify the level of intrusiveness as reasonable in view of the purpose for which the search is being conducted. Resolving that question is going to take saner heads than people whose idea of an argument is simply quoting the 4th Amendment in total ignorance of relevant case law, quoting Ben Franklin, or saying "don't touch my junk".
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