The ability to read minds, to identify dissidents. Naturally, this is the project of the Department of State Security, and its various fascist contractors.

(Thanks to Travis Holte)

UPDATE from Ryan Sertorius:

While I am most grateful for the ongoing efforts of the DHS to protect me from Islamofascistnazis, there is one thing I didn't see in that otherwise helpful video you posted. Where are the holding cells located? I'm sure that a big old trailer like the one shown has to have at least a dozen pantry-size broom closets to hold the numerous terrorists and other America haters they will catch. If they don't have them, they need to read Solzhenitsyn for some pointers straight from the NKVD. They should also show the black maria - our tax money at work.