Mo. Rev. Stat. § 490.722

The contents, writings, or tapes resulting from any communication, directly or indirectly, through TDD, TTY, or TT are inadmissible as evidence of those communications or the specific contents of the communication thereof in any court of law, legal proceeding, or administrative hearing, unless such communication could have been introduced into evidence had it occurred without the use of such auxiliary aids. This section shall not preclude the interception of wire communications pursuant to a lawful court order.