Street boozers in Wakefield are being reminded they will face punishment if they refuse to ditch their drink after one was handed a £100 fine.
Officers issued the fixed penalty notice after one drinker refused to hand over his drink when stopped in the city centre.
Most of the centre is covered by a Public Spaces Protection Order (PSPO), meaning anyone caught with an open vessel will face sanctions.
Despite this, some die-hard drinkers still congregate with cans of booze.
A police spokesman said: "The PSPO states that no alcohol should be consumed within the boundaries of this area, it's simple."