Missouri Revised Statutes Title XXX. Domestic Relations § 455.538. Law enforcement agencies response to violation of order--arrest for violation, penalties--custody to be returned to rightful party, when

4. (1) Violation of the terms and conditions of an ex parte or full order of protection with regard to domestic violence, stalking, sexual assault, child custody, communication initiated by the respondent, or entrance upon the premises of the victim's dwelling unit or place of employment or school, or being within a certain distance of the petitioner or a child of the petitioner, of which the respondent has notice, shall be a class A misdemeanor, unless the respondent has previously pleaded guilty to or has been found guilty in any division of the circuit court of violating an ex parte order of protection or a full order of protection within five years of the date of the subsequent violation, in which case the subsequent violation shall be a class E felony. Evidence of a prior plea of guilty or finding of guilt shall be heard by the court out of the presence of the jury prior to submission of the case to the jury. If the court finds the existence of a prior plea of guilty or finding of guilt beyond a reasonable doubt, the court shall decide the extent or duration of sentence or other disposition and shall not instruct the jury as to the range of punishment or allow the jury to assess and declare the punishment as a part of its verdict.

(2) For purposes of this subsection, in addition to the notice provided by actual service of the order, a party is deemed to have notice of an order of protection for a child if the law enforcement officer responding to a call of a reported incident of domestic violence, stalking, sexual assault, or violation of an order of protection for a child presents a copy of the order of protection to the respondent.