Amends TCA Section 55-10-417 and Section 55-10-425.

Tennessee HB1315 amends existing laws regarding ignition interlock devices by changing the calibration standard from blood alcohol concentration to breath alcohol concentration and allows for the tolling of the required usage period for active military personnel deployed outside the state. The bill affects individuals required to install ignition interlock devices due to alcohol-related offenses, particularly those who are active service members. Key provisions include the ability for deployed service members to request a temporary toll on the usage period and the requirement for the Department of Safety to review such requests, as well as provisions for reinstatement of driving privileges under specific compliance conditions.