§49-2-2. Duration of custody or guardianship of children committed to state department.
A child committed to the state department for guardianship, after termination of parental rights, shall remain in the care of the department until he attains the age of eighteen years, or is married, or is adopted, or guardianship is relinquished through the court.

A child committed to the state department for custody shall remain in the care of the department until he attains the age of eighteen years, or until he is discharged because he is no longer in need of care.