Missouri Revised Statutes Title XXI. Public Safety and Morals § 315.069. Hotel operator may make certain requirements for providing accommodations

(a) The authority to charge the amount due for the cost of the room, accommodations, facilities or other privileges of the hotel used by the person, and the cost of any damages to the room, furnishings in the room or other facilities of the hotel caused by the person while using the room, accommodations, facilities or other privileges of the hotel to a credit card used by a person under the age of eighteen. The granting of such authority shall be deemed a waiver of any defense based upon the age of such person which may be raised by the minor or the person authorizing the use of the credit card; or

(b) An advance cash payment sufficient to cover the cost of the room, accommodations, facilities or other privileges of the hotel used by the person, and a reasonable amount as a deposit toward the cost of any damages to the room, furnishings in the room or other facilities of the hotel caused by the person while using the room, accommodations, facilities or other privileges of the hotel. A cash deposit for any damages required by the hotel operator shall be promptly refunded to the extent not used to cover the cost of any such damages as determined by the hotel operator following an inspection of the room, accommodations or facilities of the hotel used by the person at the end of his or her stay.