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Stephen Petty - On the effectiveness of masks
Stephen Petty is a Certified Industrial Hygienist (C.I.H.), Certified Safety Professional (C.S.P.), and Professional Engineer (P.E.).
He has been a testifying expert in nearly 400 cases on exposure, exposure control, PPE and warnings and has completed or supervised thousands of forensics projects mostly for the insurance industry.
He explains to a committee panel why masks don't work.
He has been a testifying expert in nearly 400 cases on exposure, exposure control, PPE and warnings and has completed or supervised thousands of forensics projects mostly for the insurance industry.
He explains to a committee panel why masks don't work.