The breath-alcohol limit

It is forbidden to drive on public roads under state jurisdiction when the driver presents a breath-alcohol concentration (BrAC) above 0.40 milligrams per liter of exhaled air, as measured with a breathalyzer. This is the operative threshold of the breath test that officers apply at checkpoints. Fuente: Reglamento de la Ley de Tránsito y Vialidad del Estado de Yucatán, Artículo 328.