HB 4029 establishes a supplemental retirement program within the Teacher Retirement System of Texas (TRS) for law enforcement officers who are members of the system. The bill defines "supplemental program service" as membership service in a law enforcement role requiring Texas Commission on Law Enforcement certification. It allows officers with at least 25 years of service credit to retire at any age and receive a supplemental annuity. The bill also provides disability and survivor benefits specific to law enforcement officers and creates a supplemental program retirement fund to finance these benefits.