Ty posted a link that stated, “Face masks and respirators work in two ways: they protect the wearer from becoming infected and they prevent an infected wearer from spreading their germs to other people. Most RCTs in this Cochrane Review looked only at the former scenario, not the latter." Okay, let's look at the latter.
"The outbreak originated from an unvaccinated employee with a religious exemption who tested negative for COVID-19 before working a shift and wore a mask. The employee didn't feel well and tested positive after arriving home."
Link: Great example of mask failure