Sunset Laws - As enacted, extends the department of mental health and substance abuse services to June 30, 2029. - Amends TCA Title 4, Chapter 29 and Title 4, Chapter 3.

HB 243 extends the legal existence of Tennessee's Department of Mental Health and Substance Abuse Services until June 30, 2029, preventing its automatic termination. The bill amends Tennessee Code Annotated sections 4-29-246 and 4-29-250 to remove the department's previous sunset date and formally define it within state law. This affects the department's ongoing operations and the Tennessee residents who rely on its services. The law became effective April 29, 2025, after passing through the legislature.