Miss. Code Ann. § 37-11-3

In addition to all other power and authority which may now be vested in any board of trustees of any school district by the Constitution or statutes, or both, of the State of Mississippi, any such board of trustees is hereby vested with the authority to provide by assignment or reassignment, or other appropriate means, for the separation of students according to sex, separately by classrooms or schools, when such board, in its discretion, determines such separation will promote or preserve the public peace, order or tranquility of the school district, or the health, morals or education of the students.