shall not knowingly be physically present in or loiter within five hundred feet of or to approach, contact, or communicate with any child under eighteen years of age in any child care facility building, on the real property comprising any child care facility when persons under the age of eighteen are present in the building, on the grounds, or in the conveyance, unless the offender is a parent, legal guardian, or custodian of a student present in the building or on the grounds.
§ 566.148, RSMo