(a) The Board of Developmental Disabilities Services may, under such conditions and for such length of time as it may deem advisable, permit an individual to leave a human development center for the purpose of visiting in a private home and may revoke or extend the period of the visit or change the conditions upon which it is granted.
(b) The board shall, before the granting of a permit to visit, cause an investigation to be made of the home in which the individual is to visit and such other conditions and circumstances as may affect his or her welfare and behavior.
(c) The board may provide such supervision of an individual leaving the center for the purpose of a visit as it may deem advisable.
(d) An individual receiving a permit to visit shall not be deemed discharged from the center.