TSA: real mission catching terrorists or jailing you for that doobie in your backpack?

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Do people blow up trains with unsmoked joints? I was under the impression that it took some sort of explosive.
Well, I must be wrong, because the TSA is, more and more, showing up at locations outside the airport — bus stations, train stations, subways, ramps leading up to the airport, and now a train station in Oceanside, CA.
Surely, this is only about keeping us, ahem, “safe.”
(Photo: Flickr Creative Commons/Torben Hansen)