Ferguson is investigating the Oct. 17 incident in which patrol officers discovered Johnson in his parked car at 12:30 a.m. in Chicago's Bridgeport neighborhood. The officers allowed Johnson to drive himself to his home. The superintendent has said he felt ill because of problems with his medication, though he also told Mayor Lori Lightfoot he had "a couple of drinks" earlier in the night.
Johnson told reporters Monday he's "not worried" about the investigation.
Johnson also said he wouldn't have cared about making it to April as superintendent when his pension would become fully vested at the superintendent's salary.
"Remember, I didn't apply for this job," he said. "So that part doesn't matter to me, it really doesn't."
Johnson was hired in spring 2016 by then-Mayor Rahm Emanuel to be superintendent. Johnson took over a department reeling from the court-ordered release of squad car-camera video showing a white Chicago police officer shoot black teen Laquan McDonald 16 times.
During Johnson's time, the city has seen some reductions in both homicides and shootings, but the Police Department has also struggled to solve crimes, posting abysmal yearly clearance rates.
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