OSHA - https://www.osha.gov/dte/outreach/intro_osha/7_employee_ppe.pdf

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On May 15, 2008, a new OSHA rule about employer payment for PPE went into effect. With few exceptions, OSHA now requires employers to pay for personal protective equipment used to comply with OSHA standards. The final rule does not create new requirements regarding what PPE employers must provide. The standard makes clear that employers cannot require workers to provide their own PPE and the worker’s use of PPE they already own must be completely voluntary. Even when a worker provides his or her own PPE, the employer must ensure that the equipment is adequate to protect the worker from hazards at the workplace.