The drone threat -- in the U.S.

Drone proliferation raises an issue that has received too little attention: the threat that they could be used to carry out terrorist attacks.

President Obama signed a sweeping aviation bill in February that will open American airspace to "unmanned aircraft systems," more commonly known as drones. Much of the recent discussion about the coming era of domestic drones, which will include those operated by companies and individuals, has been focused on privacy questions. However, drone proliferation also raises another issue that has received far less attention: the threat that they could be used to carry out terrorist attacks.

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