The police should be able to assess the impact from their frequent checks of the bar's mandated recovery area. Check the register of breathyliser checks, register of detainees, register of taxis called to recover patrons over the limit and the CCTV record of the recovery area to ensure that 'over-the-limit' patrons have not escaped.
Officer: "Where is your recovery area"
Bar owner: " Lumpini Park, Gate 1"