Shots were fired after a local football gave over the weekend.
Teachers would be required to pass the MMPI-2, a psychological evaluation and 42.5 hours of firearms training with a qualified instructor.
According to court documents, that man is 62-year-old Zack Stearns, of Simpsonville.
Principal Jason Neuss said in a letter to parents on Tuesday that searches will not be announced in advance.
The ongoing threat of violence and guns inside Jefferson County Public Schools has led some parents to take action and encourage others to step up.
At least three other schools found guns in the past two weeks.
At the JCPS Board of Education's upcoming meeting on Tuesday, Moms Demand Action will present measures people can take to safely secure guns.
A spokesperson for Jefferson County Public Schools said a gun fell out of a student's backpack during a fight on Monday.
According to a letter sent home to parents, office staff noticed a "strong odor" of marijuana as a student was signing in late to school.
The student told authorities they had the gun because they were scared of a "situation outside of school."