The alleged transgressions are so serious that a federal watchdog indicated he plans to recommend that the Office of Personnel Management, which oversees most background checks, end ties with USIS unless it can show it is performing responsibly, the people said…

After conducting an initial background check of a candidate for employment, USIS was required to perform a second review to make sure no important details had been missed. From 2008 through 2011, USIS allegedly skipped this second review in up to 50 percent of the cases. But it conveyed to federal officials that these reviews had, in fact, been performed.

The shortcut made it appear that USIS was more efficient than it actually was and may have triggered incentive awards for the company, the people briefed on the matter said. Investigators, who have briefed lawmakers on the allegations, think the strategy may have originated with senior executives, the people said.