<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> <P> Indiana honors all other states handgun licenses, though not all other states honor Indiana's license . Because there is no obligation for one state to notify another state of any change in their gun laws the Indiana State Police does not attempt to track this information . An Illinois Firearms Owners Identification (FOID) card allows Illinois residents to purchase and possess firearms and ammunition . The FOID is not a permit to carry a handgun, therefore it is not honored as such by Indiana, but the Illinois license to carry a concealed firearm, first issued in February 2014, is honored like that of any other state . </P>

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