Travelers wait for a security check at Ronald Reagan Washington National Airport in November. Journalists traveling to the U.S. can face searches that can risk the confidentiality of their sources. (Alex Wong/Getty Images/AFP)
Travelers wait for a security check at Ronald Reagan Washington National Airport in November. Journalists traveling to the U.S. can face searches that can risk the confidentiality of their sources. (Alex Wong/Getty Images/AFP)

Security risk for sources as US border agents stop and search journalists