COLUMBIA, Mo. - Columbia police arrested Jakson Hewett-Jones on Thursday morning at Battle High School.
According to the probable cause statement, school staff smelled a controlled substance on Jones and called police.
Officers said school staff found a small amount of a "green, leafy substance" and a set of "knuckles."
Police said the "knuckles" are considered a class E felony because Jones brought them to school.
Jones was charged with unlawful use of a weapon.