Missouri Revised Statutes Title XXX. Domestic Relations § 455.505. Relief may be sought for child for domestic violence, stalking, or sexual assault--order of protection effective, where

1. An order of protection for a child who has been subject to domestic violence by a present or former household member or sexual assault or stalking by any person may be sought under sections 455.500 to 455.538 by the filing of a verified petition alleging such domestic violence, stalking, or sexual assault by the respondent.

2. A child's right to relief under sections 455.500 to 455.538 shall not be affected by the child's leaving the residence or household to avoid domestic violence.

3. Any protection order issued pursuant to sections 455.500 to 455.538 shall be effective throughout the state in all cities and counties.