Effective December 30, 2018, the State of Utah drops its per se alcohol concentration from the national standard 0.08 down to 0.05 BAC.   Utah is the first state to join the .05 group--a standard embraced by most Western Industrial nations.  In 2013, the National Transportation Safety Board argued for adopting the .05 standard, noting that research proved that above the .05 concentration drivers are impaired and at a significantly greater risk of being involved in a crash where someone is killed or injured. The standard is expected to be a challenge for law enforcement officers, as they adapt existing field investigation techniques and move to the .05 per se standard.

See news story: Washington Post Article