A new leaked CIA document from WikiLeaks reveals a few government secrets that could be useful for travelers this holiday season. In it, the CIA explains how to avoid a secondary screening at the airport if you're traveling abroad.

The basic tips: Don't bring too many new items in your luggage (sorry, Christmas gifts); don't be nervous and visibly sweating; don't change your itinerary within a day of your flight; don't be weird about passport screening procedures; and make sure your luggage isn't disproportionate to your purported reasons for your trip, which could mean how it's packed or how fancy the stuff on the inside is.

The documents also contains security procedures from around the globe, shining a light on what other countries look for in a passenger profile. Turkish accents in Iraq get you an almost automatic screening. In Israel, lone male travelers with backpacks often get secondary screening, while lone travelers from China elicit concerns of illegal immigration from Chilean authorities.

In addition, Austria and Singapore have Russian agent watch lists at the ready, and Colombia is on the lookout for Iranian and Venezuelan spies. Portugal keeps an eye out for travels from Western Africa and any of its former colonies, fearing illegal immigration. Cambodia fears terrorists from around the Arab world, while Saudi Arabia is suspect of travellers from Iraq, Iran, Libya, Palestine, and Syria. And in the Seychelles, there's plenty of fear of Nigerian drug trafficking.

Read the whole report here.

Originally published on Popularmechanics.com via The Verge.

John Wenz Writer John Wenz is a Popular Mechanics writer and space obsessive based in Philadelphia.

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