Private Investigators Have Become Twice as Good at Snooping Since 9/11

The decade following the terrorist attacks of 9/11 was a heady time for U.S. security companies. The federal government spent billions of dollars on contracts for workers to guard its buildings, and the private sector followed suit. In another corner of the industry, Americans spent increasing amounts of time online, creating reams of digital information for investigators to sift through. Adjusting for inflation, the investigation and security service industry increased sales 22 percent, to $48.8 billion, according to U.S. Census data released last week.

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