The provisions of chapter 420, Laws of 1989 shall apply equally to persons in the custody of the department on May 13, 1989, who were found by a court to be not guilty by reason of insanity or incompetent to stand trial, or who have been found to have committed acts constituting a felony pursuant to RCW
71.05.280(3) and present a substantial likelihood of repeating similar acts, and the secretary shall cause such persons to be evaluated to ascertain if such persons are developmentally disabled for placement in a program specifically reserved for the treatment and training of persons with developmental disabilities.