Occupational Health and Safety Act and regulations for health care and residential facilities : Revised Statutes of Ontario, 1990, chapter O.1, as amended : O. Reg. 67/93, as amended by O. Reg. 142/99, O. Reg. 631/05, O. Reg. 25/09, O. Reg. 495/09, O. Reg. 94/10 ; O. Reg. 97/11, O. Reg. 169/11 ; O. Reg. 474/07, as amended by O. Reg. 317/08, O. Reg. 439/09.