Missouri Revised Statutes Title XXXVIII. Crimes and Punishment; Peace Officers and Public Defenders § 568.070. Unlawful transactions with a child

(1) Being a pawnbroker, junk dealer, dealer in secondhand goods, or any employee of such person, with criminal negligence buys or receives any personal property other than agricultural products from an unemancipated minor, unless the child's custodial parent or guardian has consented in writing to the transaction; or

(2) Knowingly permits a minor child to enter or remain in a place where illegal activity in controlled substances, as defined in chapter 579, is maintained or conducted; or

(3) With criminal negligence sells blasting caps, bulk gunpowder, or explosives to a child under the age of seventeen, or fireworks as defined in section 320.110,  1 to a child under the age of fourteen, unless the child's custodial parent or guardian has consented in writing to the transaction. Criminal negligence as to the age of the child is not an element of this crime.