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The TSA surely realizes that actual trouble-makers will want to blend in. Therefore they want to alter *everyone's* behavior so that people are as submissive as possible. The obvious strategy is not to alter the behavior of the terrorists directly, but to make regular law-abiding citizens act *all the same, all the time, with total submission to authority.* That way, in order to "blend in" as any true trouble maker would want to do, the trouble-makers will have to be as cowed as everyone else. This is an obvious example of law enforcement wanting everyone to give up legitimate rights and submit unquestioningly to authority in order to force criminals to come in line with that obsequious standard.

Why not use git? Or cvs or any other source control, really. If it's really pairs, they could just email the source back & forth, and that might be easiest, provided they can manage conflicts on their own. With three or more that could be a hassle, and then I'd set up source control. Heck, make your departmental sysadmin do it! Then it'll be painless :)