It was Orange County, California US Rights Attorney Leigh Dundas, during a group demonstration of severe mask hypoxia during hot weather, using pulse oximeters: http://cvpandemicinvestigation.com/2020/06/hcq-trials-and-murder-masks-are-bad-for-you-predictive-programming-and-a-spoof HCQ Trials and... Murder? Masks are Bad For You! Predictive Programming and a Spoof - Investigating  Wearing a Mask Can Reduce Your Blood Oxygen Level to a Dangerous Level – From US Attorney, Leigh Dundas NOTICE: 6/9/20 Mask-Wearing Caused DANGEROUS Drops in Oxygen Levels in OC Residents ... Leigh’s email to the Orange County Board of Supervisors on the same day: ‘[During the mask/oximeter demonstration] ... the residents proceeded to go outside onto the steps of the County Hall, at noon, in the 100 degree heat, and put on the “mandated masks” while using a Pulse Oximeter to measure their oxygen levels and heart rate.   The results were nothing short of horrifying:   ALL of the individuals had their oxygen rate drop from a healthy 98 or 99% (without the mask) – a total of five, ten, and sometimes twenty full points – within a few minutes of mask-wearing.   Medically, below 92% is considered “dangerous” – while below 90% oxygen merits a denomination of “hypoxemic”   The AVERAGE drop of these OC residents in oxygenation was more than 12 points, into the hypoxemic range.   Two of the participants, one a very fit daily runner, and one a very fit nurse, had their oxygen rates drop into the 70s – where organ damage, systems failure, and death can occur.   ALL participants suffered dangerous drops in oxygen: 43% fell into the “dangerous” zone, 29% in the hypoxemic zone, and 29% fell into the extremely dangerous hypoxemic zone (where cardiac arrest, organ failure and death occur.)   Even those who just stood around in the masks doing absolutely nothing had frightening drops in oxygen levels.   As context, most of the participants were in decently good health, and not overweight.   I’m sure I don’t need to extrapolate for the reader what could happen if this test were performed with an average cross section of citizens, i.e., with the nearly 40% of OC residents who suffer from at least one chronic health condition, and with the more than 20% of OC residents who are obese.   It is a striking juxtaposition to note that Medicare and most insurance companies will pay for people with oxygen rates of less than 88% to get supplemental oxygen and all carriers and health experts advise you to seek immediate medical intervention below 88% – and the average oxygen rate was two points less than that at 86% after only a few minutes of mask-wearing. ..’ + Huge # excellent LINKS from CDC, WHO & studies in medical journals: http://vaccineimpact.com/2020/face-masks-harm-children-and-some-have-even-died-but-california-governor-dictates-everyone-to-wear-them  Face Masks Harm Children and Some Have Even Died – But California Governor Dictates Everyone to Wear by Brian Shilhavy Editor, Health Impact News Here are the resources civil rights attorney Leigh Dundas uses to show the dangers of wearing face masks and the harm they cause: Excerpts from Studies Involving Mask-Wearing 	•	Study on CDC website which reviewed ten different randomized clinical trials, world-wide, reviewing highly infectious respiratory virus transmission which found “no significant reduction” in “transmission with the use of face masks.” https://wwwnc.cdc.gov/eid/article/26/5/19-0994_article. Nonpharmaceutical Measures for Pandemic Influenza in Nonhealthcare Settings—Personal Protective and Environmental Measures, Jingyi Xiao1, Eunice Y. C. Shiu1, Huizhi Gao, Jessica Y. Wong, Min W. Fong, Sukhyun Ryu, and Benjamin J. Cowling (Volume 26, Number 5, May of 2020). 	•	World Health Organization states there “is no evidence wearing a mask by a healthy person in a community setting can prevent infection with respiratory viruses, including COVID-19” and further  concludes “universal community masking” is ineffective at preventing “infection from respiratory viruses, including COVID-19.” ... [MUCH MORE at Link]