(7) Possession of a pistol, gun or firearm on school property;

(8) Possession of a knife and other weapons, as defined in § 39-17-1301 on school property [...]

(2) Notwithstanding other provisions of this section or another law to the contrary, a student has committed of a zero tolerance offense if the student:

(A) Brings to school or is in unauthorized possession on school property of a firearm, as defined in 18 U.S.C. § 921;

(B) A student commits aggravated assault as defined in § 39-13-102 or commits an assault that results in bodily injury as defined in § 39-13-101(a)(1) upon any teacher, principal, administrator, any other employee of an LEA, or a school resource officer; or

(C) A student is in unlawful possession of any drug, including any controlled substance, as defined in §§ 39-17-402–39-17-415, controlled substance analogue, as defined by § 39-17-454, or legend drug, as defined by § 53-10-101, on school grounds or at a school-sponsored event.

(3) Nothing in this section prohibits the assignment of students who are subject to expulsion from school to an alternative school.

(4) Disciplinary policies and procedures for all other student offenses, including terms of suspensions and expulsions, must be determined by local board of education policy.

(5) If a student threatens mass violence on school property or at a school-related activity pursuant to § 39-16-517, then the director of schools or the head of the public charter school, as applicable, shall require the student to submit to a threat assessment to determine whether the threat of mass violence made by the student was a valid threat. The student may be suspended from attendance at the school and from school-sponsored activities until the threat assessment is complete. If the director of schools or the head of the public charter school determines, based on the results of the threat assessment required in this subdivision (g)(5), that the threat of mass violence made by the student was not a valid threat, then the student shall not be expelled for committing a zero tolerance offense, but may be suspended in accordance with this section. 

(6) For purposes of this subsection (g):

(A) "Expelled" means removal from the student's regular school program at the location where the violation occurred or removal from school attendance altogether, as determined by the school official; and

(B) "Zero tolerance offense" means an offense committed by a student requiring the student to be expelled from school for at least one (1) calendar year that can only be modified on a case-by-case basis by the director of schools or the head of a charter school.

(i) Notwithstanding subsection (a) or (b) or any other law to the contrary, if a pupil is determined, via a fair and thorough investigation made by the principal or the principal's appointed representative, to have acted in self-defense under a reasonable belief that the student, or another to whom the student was coming to the defense of, may have been facing the threat of imminent danger of death or serious bodily injury, which the student honestly believed to be real at that time, then, at the principal's recommendation, the student may not face any disciplinary action. 

(4) Possession of weapons on school property or at school functions [...]

(1) Unauthorized possession on school property of a firearm, as defined in 18 U.S.C. § 921.

(5) Subject to Section 49-6-3401(g)(5), threatens mass violence on school property or at a school-related activity pursuant to Section 39-16-517 

(1) "Dangerous weapon" or "weapon" means any dangerous instrument or substance that is capable of inflicting any injury on any person.

(1) The removal of dangerous weapons, drug paraphernalia and drugs from school property is necessary to lessen hazards to students and that removal can only be accomplished by searches of areas of the school buildings or grounds where those materials may be stored;

(2) On occasions when the use of dangerous weapons or drugs has reached a life or health threatening level, searches of students themselves may be necessary to protect the larger student body, and that often the searches must be conducted in emergency situations;

(3) Individual circumstances and local particularities require that individual principals must be relied on to exercise their professionally trained judgments in determining what action is appropriate within this part; and

(4) The presence on school property of students with drugs in their bodies may pose a threat to the safety and well-being of that student and other students, may be disruptive of school classes and other programs and may interfere with the educational opportunities and progress of all students.

(2) The search will yield evidence of the violation of school policy or will lead to disclosure of a dangerous weapon, drug paraphernalia or drug.

(6) Where the incident involved a weapon, whether the weapon was a firearm, knife or other weapon.