A biologist holds a slide prepared for testing in a micro array for biological hazards at the Lawrence Livermore National Laboratory in Livermore, Calif. Ben Margot/AP hide caption

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Passengers wait to get their passports checked at Miami International Airport earlier this year. The visa waiver program allowed 20 million travelers into the U.S. last year, with much less screening than refugees receive. Getty Images hide caption

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4 Things To Know About Visa Waivers And Security

The visa waiver program allowed 20 million travelers into the U.S. last year. Many say it poses a bigger threat than the refugee resettlement program.

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Syrian refugee Hussam Alroustom, who fled with his wife and two young children, looks over a booklet with identification information in his family's apartment in Jersey City, N.J., in September. The U.S. has resettled around 1,800 refugees from Syria in the past two years. Julio Cortez/AP hide caption

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A study by two U.S. senators estimated that 99 percent of cable TV subscribers rent their set-top boxes and pay on average $231 a year to do so. Ariel Zambelich/NPR hide caption

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A Volkswagen Passat is tested for exhaust emissions, at a Ministry of Transport testing station in London. In the U.S., a 1998 copyright law prevents safety researchers from accessing the software that runs cars. John Stillwell/PA Photos/Landov hide caption

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