The Federal Government is currently considering lowering the Blood Alcohol Content to .05 instead of .08. They base this number on studies out of Europe which showed that lowering the BAC to .05 reduced DUI related deaths by 50%. If the federal government demands that the states support this change, Idaho will likely follow and change the BAC to .05. Right now this is just a talking point but don't be surprised to see Idaho lower the BAC in the near future.

http://www.usatoday.com/story/news/nation/2013/05/14/national-transportation-safety-board-drunken-driving/2158107/