Maryland Code, Education § 26-103

(a)(1) Unless locally approved by the county board of education, a person may not drink or possess any alcoholic beverage on the premises of any public school.

(2) A person who drinks or possesses any alcoholic beverage and causes a public disturbance at any elementary or secondary school athletic contest may not refuse to comply with a request by a law enforcement officer to stop drinking and causing the public disturbance.  If the person complies with the first request, he may not be charged under this paragraph.

(b)(1) Any person under 18 years of age who violates the provisions of this section shall be issued a citation and be subject to the dispositions for a violation under Title 3, Subtitle 8A of the Courts Article.

(2) Any person 18 years old or older violating the provisions of this section shall be issued a citation and be subject to § 10-119 of the Criminal Law Article.