Notwithstanding any enactment to the contrary, it shall be sufficient for a court of summary jurisdiction to consist of one justice only when hearing, trying, adjudging, and determining a charge or information against any person of having been found drunk in any highway or other public place, whether a building or not, or on any licensed premises, under section twelve of the [35 & 36 Vict. c. 94.] Licensing Act, 1872.