Mask expert shares his abundant knowledge and experience. Spoiler alert: THEY DON'T WORK. But they DO CAUSE HARM. TL;DR: masks have not ever been and cannot be an effective control for airborne virus control. Engineering controls (air filtration/circulation and destruction) have been the solution for 80 years with good reason. Stephen Petty: Certified industrial hygienist; Certified safety professional; Professional engineer; 45 years in the field of health and safety, trying to protect workers and the public from toxins; Named/testified in over 400 legal cases related to exposure control and personal protective equipment (PPE); talks us comprehensively through 50 years of evidence showing the ineffectiveness of masks in mitigating SARS-Cov-2, the COVID virus. Source article: https://metatron.substack.com/p/everything-you-wanted-to-know-about?utm_source=email