Richardson allegedly told the officers at the Grand Crossing District station that he had been assigned by another district.
The boy and his police partner spent five hours on patrol making traffic stops before returning to the station.
His partner failed to realise the boy was an imposter until they returned to the police station, where a senior officer became suspicious.
When challenged, the boy was unable to produce a police badge. A search found his holster was empty and a newspaper stuffed into the bag where he was meant to carry his bulletproof vest.
The incident caused major embarrassment for the Chicago police force, one of America's largest.
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