Mo. Rev. Stat. § 621.275
2. Any person filing an appeal with the administrative hearing commission shall be entitled to a hearing before the commission. The person shall file a petition with the commission within thirty days after the decision of the director of the department of public safety is sent in the United States mail or within thirty days after the decision is delivered, whichever is earlier. The director's decision shall contain a notice of the person's right to appeal:
"If you were adversely affected by this decision, you may appeal to the administrative hearing commission. To appeal, you must file a petition with the administrative hearing commission within thirty days after the date this decision was delivered. If your petition is sent by registered or certified mail, it will be deemed filed on the date it is mailed; if it is sent by any method other than registered mail, it will be deemed filed on the date it is received by the commission.".
(L. 2014 H.B. 1299 Revision)