Background check records of 25,000 undercover investigators and other homeland security staff were exposed in the breach at US Investigations Services (USIS) USIS is the third-party commercial firm that performs employee background checks for the Department of Homeland Security. USIS has said the incident had “all the markings of a state-sponsored attack” USIS did not undergo any rigorous process to assess its security posture and ensure that certain security policies were upheld, says Rick Dakin, CEO of Coalfire, the nation’s largest independent IT governance, risk and compliance firm.”]