You know that computer you ordered for Christmas that ended up with a delayed delivery? This is the real reason why it was late. 
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Old-fashioned methods get a mention too. Der Spiegel said that if the NSA tracked a target ordering a new computer or other electronic accessories, TAO could tap its allies in the FBI and the CIA, intercept the hardware in transit, and take it to a secret workshop where it could be discretely fitted with espionage software before being sent on its way.