The annual rating is a part of MADD's Campaign to Eliminate Drunk Driving. Definitions of stars are based on five categories: ignition interlocks, sobriety checkpoints, license revocation, child endangerment and non-refusal events, according to the Report to the Nation.
Indiana legislatures passed a law in 2014 to require ignition interlocks for repeat drunk drivers, and to allow judges to require the devices for first-time offenders, according to the report.
In comparison, Illinois was rated five-stars, Kentucky was rated two-stars, Michigan was rated two-stars and Ohio was rated four-stars. Thirteen states have five-stars and only two states, Montana and Rhode Island, have one-star.
Standard field sobriety tests consist of one leg stand test, walk and turn test and HGN (eye) test. Non-standardized testing consists of Rhomberg balance test, finger-to-nose test, finger-count test, hand past test, ABC test and numbers backward test, according to fieldsobrietytests.org.