A 20-year Metro police veteran was arrested overnight after his supervisors became suspicious that he was under the influence of alcohol while on duty.
Officer Arthur Messmer, of the newly formed Madison Precinct, was charged with DUI and possession of a firearm while under the influence of an intoxicant after while he was working the midnight shift.
Messmer has been decommissioned of all police authority and now faces disciplinary action following a police department internal investigation into his actions.
He is the second Metro police officer charged with DUI  since late Saturday night.
According to police, when his superiors called Messmer, 44, back to the station shortly after the midnight shift roll call to handle some administrative matters, a sergeant detected the odor of alcohol and questioned Messmer, who acknowledged drinking earlier in the day Monday.
Messmer submitted to field sobriety tasks, which police allege showed indicators of impairment. A blood sample was drawn prior to Messmer’s booking and will be analyzed by the TBI Crime Laboratory.
His bond on the two charges was set by a judicial commissioner at $10,000.