According to an article:
NcNair [sic] High School was put on lockdown Monday morning after a gun was found in a student’s possession.
Channel 2 Action News reported that a 15-year-old student brought an unloaded 9mm handgun to the school on Bouldercrest Road in south DeKalb County.
The student, whose name has not been released, was arrested.
According to Channel 2, the student was already on suspension when he came to school with the gun, but it was not immediately clear if it was an in-school suspension or he supposed to be out of school.
The lockdown was lifted by late Monday morning.
The article doesn't say where the boy got the gun.
Every gun in the hands of a child must first pass through the hands of an adult.