Stephen E. Petty, P.E., CIH, testified as an expert and was accepted as such without
objection. Mr. Petty has served as an expert witness in approximately 400 cases relating to toxic
or infectious exposure, personal protective equipment (“PPE”), and as a warning expert. He also
served as an epidemiology expert for the plaintiffs in the Monsanto “Roundup” cases, and for
those in the Dupont C8 litigation. In connection with his service as an expert, he was deposed
nearly 100 times and has provided court testimony in approximately 20 trials. Mr. Petty holds
nine U.S. patents, has written a book comprising nearly 1,000 pages on forensics engineering, is
a certified industrial hygienist, and a recognized expert with the Occupational Safety and Health
Agency. Mr. Petty helped write the rules on risk assessment for the State of Ohio and has trained
Ohio’s risk assessors.
Mr. Petty explained that the field of his expertise is “to anticipate and recognize and
control things that could hurt people, everything from making them sick to killing them.”
He testified that, in this context, he has analyzed the use of masks and social distancing in
connection with Covid-19. He testified that both the six-foot-distancing rule, and mask
mandates, are wholly ineffective at reducing the spread of this virus. Masks are worthless, he explained, because they are not capable of filtering anything as small as Covid-19 aerosols.
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