The federal government spent more than $775 million over three years on salaries for workers put on administrative leave, according to a study first reported by The Washington Post.

More than 57,000 employees were paid to stay home for a month or longer from October 2010 to September 2013, according to a forthcoming Government Accountability Office (GAO) report.

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They earned pensions, vacations, sick days and raises as well as their paychecks, while the government investigated claims of misconduct or took steps to return them to work. The vast majority were out between one to three months, but about 4,000 stayed home for three months to a year. Some even received paid leave for more than a year.

The Office of Personnel Management’s handbook doesn’t permit administrative leave except in rare circumstances, according to the Post. The agency’s handbook only allows it if the person could become a threat, or in short-term situations including organ donation or attending a funeral of a family member who served in the military.

But that hasn’t stopped the federal government from extending it for months in some cases, upsetting lawmakers.

“It’s not authorized by any law,” Sen. Chuck GrassleyChuck GrassleyWhite House clarifies: We condemn all violence Republican lawmakers criticize Trump response to Charlottesville Grassley reverses ‘expectation’ of Supreme Court vacancy this year MORE (R-Iowa) told the Post. “Bureaucrats are abusing it.”

Grassley, along with Sen. Jon TesterJon TesterWhy 'cherry-picking' is the solution to our nation’s flood insurance disaster Trump signs Veterans Affairs bill at New Jersey golf club It's time for McConnell to fight with Trump instead of against him MORE (D-Mont.), wants to codify a paid leave requirement that limits the practice.

Three State Department officials, and another who later resigned, were placed on administrative leave for months after the agency’s Accountability Review Board criticized them over the Benghazi terror attacks.

Former Internal Revenue Service official Lois Lerner also received paid leave before her eventual resignation.