In Mexico, the federal alcohol limit is 0.08% BAC (0.8 g/L). Mexico City and several states apply a stricter 0.04% (0.4 g/L), and commercial drivers (taxi, bus, freight) face 0.0% zero tolerance. Exceeding any of these triggers a mandatory 20–36 hour arrest in CDMX ("El Torito") and equivalent sanctions in other states.