Maryland Code, Education § 7-307

(a)(1) A principal, teacher, school security guard, or other school system personnel in any public school may take reasonable action necessary to prevent violence on school premises or on a school-sponsored trip, including intervening in a fight or physical struggle that takes place in his or her presence, whether the fight is among students or other individuals.

(2) The degree and force of the intervention may be as reasonably necessary to prevent violence, restore order and to protect the safety of the combatants and surrounding individuals.

(1) Shall be compensated by the county board for any necessary medical expenses that result directly from the preventive action or intervention; and

(2) May not lose any compensation for time lost from school duties that results directly from the preventive action or intervention, but compensation may be reduced by any payments made under the Maryland Workers' Compensation Act.  1

(1) Shall provide legal counsel for the principal, teacher, school security guard, or other school system personnel or may provide reimbursement for the reasonable expenses of the legal defense of any criminal charge if the county board considers it appropriate; and

(2) Shall save the principal, teacher, school security guard, or other school system personnel harmless from any award or decree against him.