Paradoxically, from public health perspective that does not matter. If you study efficacy of masks, adherence to masking protocols is absolutely crucial variabl

Paradoxically, from public health perspective that does not matter. If you study efficacy of masks, adherence to masking protocols is absolutely crucial variable to control. However, if you study efficiency of masking mandates, you do not get the luxury of controlling masking protocols and *have* to take adherence to masking protocols as population parameter. As expected, studies where actual adherence is in the gutter find masking mandates ineffective at population level.