<P> It is illegal for anyone, except for law enforcement officers and authorized school resource officers, to possess a firearm on school property (K - 12 and day care) or on a school bus, except that lawful gun owners may have guns in their vehicles on school property provided that the gun is stored out of plain sight in the person's locked motor vehicle or that the driver is only transporting someone to, or from, a school event . It is also illegal to carry a firearm on a commercial airplane or in the controlled section of an airport, on a riverboat gambling cruise, at the Indiana State Fair, courthouses and the Indiana Statehouse and Government Center . Carrying on Army Corps of Engineers property which include Brookville Lake, Cagles Mill Lake, Cecil M. Harden Lake, J. Edward Roush Lake, Mississinewa Lake, Monroe Lake, Patoka Lake, and Salamonie Lake is restricted according to CFR Title 36, Chapter 111, Part 327 . </P> <P> Private businesses may restrict or forbid firearms on their properties . However, a 2010 law prohibits employers from discharging employees for in - vehicle firearms possession on business property . Furthermore, an employer may not ask any employee about the possession of firearms and / or ammunition . </P> <P> Firearms dealers or private individuals may not sell any firearm to someone less than 18 years old, or less than 23 years old if the buyer was "adjudicated a delinquent child for an act that would be a felony if committed by an adult", or to a person who is mentally incompetent or is a drug or alcohol abuser . </P> <P> All NFA - regulated weapons and devices are legal in Indiana . </P>

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