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Next time you ride a CTA train, you could have your bags screened by Chicago Police.

It's part of Chicago's ongoing efforts to combat terrorism.

Starting November 3, police will start screening CTA rail passenger bags for explosives.

A special detail of up to six officers will randomly pull aside passengers to swab their bags and run the swab through a machine called a mobile threat detector.

The results can be seen in seconds.

The police teams will be stationed outside of turnstiles at transit stations, asking random passengers if they are willing to submit to screening.

If a passenger declines, they could be denied entry and could be arrested under the officer's discretion.