1. The department of social services shall provide protective services for children that meet the criteria established in section 191.737. In addition the department of social services may provide preventive services for children that meet the criteria established in section 191.737.

2. No department shall cease providing services for any child exposed to substances as set forth in section 191.737 wherein a physician or health care provider has made or approved a written assessment which documents the child as being at risk of abuse or neglect until a physician or health care provider authorizes such file to be closed.