TUCSON, Ariz. (AP) — Police chief or not, that didn't stop a Tucson officer from giving his boss a warning during a traffic stop.

Tucson police Chief Chris Magnus was pulled over last week for a red-light infraction.

A recording of the March 26 traffic encounter shows the officer found his boss sitting in the driver's seat of a dark-colored SUV still in his uniform.

Magnus says he doesn't think the officer realized who he was until after he pulled him over.

The video shows Magnus repeatedly thanking the officer for doing his duty.

Magnus tells the Arizona Daily Star that he still thinks the light was yellow.

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Information from: Arizona Daily Star, http://www.tucson.com