U.S. Coast Guard Health Technician Nathan Wallenmeyer (L) and Customs Border Protection (CBP) Supervisor Sam Ko conduct prescreening measures on a passenger arriving from Sierra Leone at O'Hare ... more 
U.S. Coast Guard Health Technician Nathan Wallenmeyer (L) and Customs Border Protection (CBP) Supervisor Sam Ko conduct prescreening measures on a passenger arriving from Sierra Leone at O'Hare International Airport's Terminal 5 in Chicago, in this handout picture taken October 16, 2014. REUTERS/U.S. Customs Border Protection/Melissa Maraj/Handout via Reuters less 
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Reuters | Photo By HANDOUT / Reuters
Thu, Oct 23, 2014 10:12 AM EDT