A charge that only supports a citation does not remove anyone from a house. This is the link that killed the previous market.
1 · RSMo § 569.140.1–.2 — trespass in the first degree
“1. A person commits the offense of trespass in the first degree if he or she knowingly enters unlawfully or knowingly remains unlawfully in a building or inhabitable structure or upon real property. 2. A person does not commit the offense of trespass in the first degree by entering or remaining upon real property unless the real property is fenced or otherwise enclosed in a manner designed to exclude intruders or as to which notice against trespass is given by: (1) Actual communication to the actor; or (2) Posting in a manner reasonably likely to come to the attention of intruders.”
Subsection 2 is the fence-or-notice condition, and read where it lands: it qualifies entering or remaining "upon real property" — the open-land case. Subsection 1 names a building or inhabitable structure separately.
Read it at the source →2 · RSMo § 569.140.3 — grading
“The offense of trespass in the first degree is a class B misdemeanor, unless the victim is intentionally targeted as a law enforcement officer, as defined in section 556.061, or the victim is targeted because he or she is a relative within the second degree of consanguinity or affinity to a law enforcement officer, in which case it is a class A misdemeanor. If the building or real property is part of a nuclear power plant, the offense of trespass in the first degree is a class E felony.”
This is the link that killed the previous market elsewhere — an offense graded so low that the officer may only write a citation. Missouri grades this a misdemeanor, and the next link is the state's warrantless-arrest statute at that grade. Read them in order.
Read it at the source →3 · RSMo § 544.216 — powers of arrest; arrest without warrant
“Except as otherwise provided in section 544.157, any sheriff or deputy sheriff, any member of the Missouri state highway patrol, and any county or municipal law enforcement officer in this state, except those officers of a political subdivision or municipality having a population of less than two thousand persons or which does not have at least four full-time nonelected peace officers unless such subdivision or municipality has elected to come under and is operating pursuant to the provisions of sections 590.100 to 590.150, may arrest on view, and without a warrant, any person the officer sees violating or who such officer has reasonable grounds to believe has violated any ordinance or law of this state, including a misdemeanor or infraction, over which such officer has jurisdiction.”
Note the carve-out in the middle of the sentence: officers of a political subdivision or municipality under two thousand people, or without at least four full-time nonelected peace officers, are excepted unless the subdivision has opted in. Note also that the power runs on "reasonable grounds to believe" — which is the officer's judgment about the very thing the intruder's paperwork is designed to cloud.
Read it at the source →4 · RSMo § 534.604.1, .3 — arrest for violating the removal order
“1. When a law enforcement officer has probable cause to believe that a party, against whom an ex parte order under section 534.602 has been entered and who has notice of such order entered, has committed an act in violation of such order, the law enforcement officer shall arrest the offending party-respondent regardless of whether the violation occurred in the presence of the arresting law enforcement officer. … 3. A violation of the terms and conditions of an ex parte order under section 534.602 shall be a class A misdemeanor.”
Two other provisions sit alongside it. § 534.602.10: "If appropriate, the sheriff may arrest any person found in the dwelling for trespass, outstanding warrants, or any other legal cause." And § 534.602.13: "The provisions of this section do not limit the rights of a property owner or limit the authority of a law enforcement officer to arrest an unlawful occupant for trespassing, vandalism, theft, or other crimes." These are the provisions, in order. We have drawn no conclusion from them.
Read it at the source →These are the provisions, in order. We have not drawn a conclusion from them — that is not ours to draw.