The Secret Service has a history of imposing far lower penalties than the FBI for drunken driving and other alcohol-related incidents, according to an expert familiar with federal law enforcement policies and a Secret Service misconduct report provided to Congress last week.

The agency also has ratcheted up its discipline for the most severe infractions over the last two years but still fails to impose discipline uniformly after the prostitution scandal ensnared more than a dozen agents in Colombia in 2012, according to three sources with first-hand knowledge of the process.

The FBI requires at least a 30-day suspension without pay for an off-duty drunk-driving charge, according to Larry Berger, an attorney who has served as a general counsel for the Federal Law Enforcement Officers Association.

“And it goes up from there,” depending on the circumstances, he said.

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