This is all I could find. I knew that truck drivers and kids were lower, but I don't think the guy in the story was either. But I live in Ohio, not Indiana so it could be different. Or maybe I read this wrong.
Originally Posted by RYou
Drinking and Driving Laws in Ohio
It is illegal in the State of Ohio to drive with a blood alcohol concentration (BAC) of .08 or above. The limit is lower for commercial drivers and drivers under the age of 21. In Ohio a DUI is called a OVI, meaning "Operating a Vehicle Intoxicated". The Ohio OVI law includes alcohol or drugs or both. While the OWI specify's a .08 BAC in the case of alcohol, it is illegal to drive with any amount of a controlled substance such as marijuana, cocaine, heroin, or meth present in the driver's blood.
Here is the link I got it from: http://dui.drivinglaws.org/ohio.php