(a) 
Operation of vehicle by person under the influence of intoxicating liquor or narcotic drugs.
It shall be unlawful and an offense for any person to drive or operate any automobile or any vehicle upon any street or alley within the limits of the city while such person is intoxicated or in any degree under the influence of intoxicating liquor or narcotic drugs.
(b) 
Control of vehicle by person under the influence of intoxicating liquor or narcotic drugs.
(1) 
It shall be unlawful and an offense for any person to be in actual physical control or to assume control of any vehicle while such person is in any degree under the influence of intoxicating liquor or narcotic drugs.
(2) 
It shall be unlawful and an offense for any person to operate any vehicle upon any street or alley in the city while said person is under lawful medication if such medication is capable of rendering said operator incapable of proper control of said vehicle.
(3) 
Proof that a person was sitting behind the steering wheel of a vehicle shall be prima facie evidence that the person was in actual physical control of the vehicle.
(1987 Code, ch. 9, secs. 6A, 6B; 2004 Code, secs. 12.601, 12.602)