From the TSA:
This notice is to explain why passengers may notice additional security measures related to remote control devices. In view of the period of strategic warning discussed in the National Intelligence Estimate on Homeland Security released in July, TSA is carefully monitoring information developed in the law enforcement and intelligence communities related to methods of possible attack.
While not associated with a specific threat at this time, TSA is aware that remote control toys can be used to initiate devices used in terrorist attacks.
Accordingly, Transportation Security Officers have trained on this possibility and travelers may encounter additional screening when bringing remote control devices in carry-on baggage.
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