Missouri Revised Statutes Title XII. Public Health and Welfare § 191.662. Department of mental health, permissive HIV testing without right of refusal, when--results of testing not to be reported to department of health and senior services, when

(1) Any individual participating in a methadone treatment program for the treatment of intravenous drug abuse and who has refused to undergo such testing whenever there are reasonable grounds to believe that the individual is infected with HIV and is a reasonable health threat to others;

(2) Any individual under the care and custody of the department of mental health who has refused to undergo testing whenever there are reasonable grounds to believe that the individual is infected with HIV and is a reasonable health threat to others, unless such testing is otherwise prohibited by law.