Missouri Revised Statutes Title XXXIII. Evidence and Legal Advertisements § 492.400. When depositions may be read

(1) If the witness resides or is gone out of the state;

(2) If he is dead;

(3) If by reason of age, sickness or bodily infirmity he is unable to or cannot safely attend court;

(4) If he resides in a county other than that in which the trial is held, or if he has gone a greater distance than forty miles from the place of trial without the consent, connivance or collusion of the party requiring his testimony;

(5) If he is a judge of a court of record, a practicing attorney or physician and engaged in the discharge of his official or professional duty at the time of the trial;

(6) If the witness is absent without the consent, connivance or collusion of the party requiring his testimony and the party, in the exercise of due diligence, has been unable to procure the attendance of the deponent by subpoena.