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.