CHICAGO (AP) — Chicago Police Superintendent Eddie Johnson asked the city’s police department to conduct an internal investigation on himself Thursday after he was found lying down in a car.

A passerby found Johnson early Thursday in a car parked near a stop sign and called 911. Police department spokesman Anthony Guglielmi said in a statement that Johnson indicated he parked his car after feeling lightheaded. Officers checked on Johnson’s well-being and didn’t observe any signs of impairment.

Johnson drove himself to his home nearby.

“There were no charges of intoxication, no information of intoxication as far as I know,” Guglielmi said.

Guglielmi says Johnson requested the investigation because he believes officers and the superintendent “ought to be held to the highest standard.”

“So what that means is they’re going to interview the officers, they’re going to look at all available evidence just to make sure that this is above-board and happened as described,” Guglielmi said.

The 59-year-old Johnson underwent kidney transplant surgery in August 2017. His son Daniel was the donor.