I can post study after study, but perhaps they aren't compelling.
They aren't compelling at all. I've done my own study and the failure rate is 100%.
My wife-- has been wearing masks with her patients for the past 2.5 years. Sometimes her patients also wear a mask, sometimes they don't. But in this case, the patient was also wearing a mask, and it's the very first time a patient has told her after a session "Hey I developed symptoms shortly after our appointment and then I tested positive." And then a couple days later, my wife tested positive. This is the first and only time in 2.5 years that a direct contact trace with a known positive case has occurred, and it penetrated the mask. That represents a 100% failure rate of the mask working, against a known positive.
My son- had been wearing a mask at school for over a year. All other students were required to wear masks. The first and only time we were notified of a direct contact trace from a confirmed positive child in his class, a child he sat with for an hour every day at a distance of about 2-3', it penetrated the mask. That represents a 100% failure rate of the mask working, against a known positive.
My daughter is the exact same story. Both kids wearing masks, sit next to each other for an hour per day at less than 6', the first and only time we're notified of a direct contact trace from a known positive, and my daughter turns up positive as well. That represents a 100% failure rate of the mask working, against a known positive.
100% failure rate in my own clinical study. I'm satisfied with the accuracy and legitimacy of my conclusion.