Missouri Revised Statutes Title VI. County, Township and Political Subdivision Government § 67.315. Intoxicated persons, how handled--officer granted immunity from legal action, when

1. A person who appears to be incapacitated or intoxicated may be taken by a peace officer to the person's residence, to any available treatment service, or to any other appropriate local facility, which may if necessary include a jail, for custody not to exceed twelve hours.

2. Any officer detaining such person shall be immune from prosecution for false arrest and shall not be responsible in damages for taking action pursuant to subsection 1 above if the officer has reasonable grounds to believe the person is incapacitated or intoxicated by alcohol and he does not use unreasonable excessive force to detain such person.

3. Such immunity from prosecution includes the taking of reasonable action to protect himself or herself from harm by the intoxicated or incapacitated person.