Mo. Rev. Stat. § 105.475: Lobbyist exceptions.

1. The provisions of sections 105.470 to 105.473 shall not apply to any public official or a staff member, employee, spouse or dependent child of a public official when employed by a lobbyist principal and who is acting on behalf of the lobbyist principal in their employment, except if such person's employment is as a lobbyist for the lobbyist principal.

2. The provisions of sections 105.470 to 105.473 shall not apply to any member of a union who is acting in either an employment capacity or contractual capacity in association with the union, except if such person's employment or contractual capacity is as a lobbyist for the union.