Stephen Petty - On the effectiveness of Masks

Stephen Petty, Certified Industrial Hygienist, Testifies Before the New Hampshire State Senate on Masks, March 30, 2022 “I'm a certified industrial hygienist, certified safety professional, professional engineer. I've been working 45 years in the field of health and safety.

His channel is here: https://www.youtube.com/@pettypodcasts6968

Slides from his presentation are here:
https://rebuildnh.com/wp-content/uploads/2022/03/1_Petty_New_Hampshire_Legislature_Presentation_January_27_2022.pdf

If I got something wrong in my notes, please let me know so I can update the info.