We present evidence from the Fatality Analysis Reporting System and Behavioral Risk Factor Surveillance System that shows increased seat-belt use following the enactment of stricter BAC thresholds in states where seat-belt laws are primarily enforced. This suggests that inebriated drivers may use their seat-belts more judiciously to avoid being identified as a drunk driver by law enforcement. The interactive effect of stricter drunk driving laws and primary seat-belt laws are also shown to be more effective than either law passed in isolation in terms of reducing traffic fatalities.