In Oklahoma City, it’s illegal for a minor to possess a “broad-tipped” permanent marker. Here’s the ordinance:
§ 35-201. – Prohibition on possession of aerosol spray paint by minors.
No person under the age of 18 years may possess an aerosol spray paint container or broad-tipped indelible marker on any public property unless accompanied by a parent, guardian, employer, teacher or other adult in any similar relationship and such possession is for a lawful purpose.