The amount a person can consume before becoming impaired or exceeding the 0.08 BAC standard (legal limit) varies by person. The general rule is one regular drink per hour, spaced out, should keep you near 0.00 BAC. Two or more drinks in an hour will tend to cause your BAC to rise. However, any alcohol in your system may be used as proof you were drinking and any alcohol scent on your breath or clothes might turn a traffic stop into a DWI investigation. Your best bet is to avoid drinking and driving.