Okla. Stat. tit. 70 § 24-131
The superintendent or principal of any secondary, middle or elementary school shall have the authority to order any person out of the school buildings and off the school property when it appears that the presence of such person is a threat to the peaceful conduct of school business and school classes. This authority shall extend to the removal of any individual attending an official school activity or field trip where students are present, including an activity or field trip not on school property, when the superintendent or principal determines that a threat to the peaceful conduct of students exists. Any person who refuses to leave after being ordered to do so by the superintendent or principal shall be guilty of a misdemeanor and upon conviction thereof shall be punished by a fine of not more than Five Hundred Dollars ($500.00) or by imprisonment in the county jail for not more than ninety (90) days, or by both such fine and imprisonment.
Okla. Stat. tit. 70, § 24-131