This particularly leapt out:
One unforeseen problem for those mandating the continued and long-term wearing of face masks, such as governments and businesses, is the potential for future litigation if they are proven to have any long-term adverse impacts on human health – especially since long-term studies have yet to be undertaken.
Patterson, who has advised some of the world’s biggest clothing retailers and brands on chemical management agrees this could be an issue.
“I’d be very wary of mandating masks, as some chemicals and fibres may have long-term effects – and that possibly opens the floodgates of personal injury claims at some stage in the future.”
With regard to future litigation, I somehow don't see that gaining any traction - it's a near certainty that the scoundrels mandating the use of masks - the same scoundrels who said masks were useless, then u-turned - will devise a way to exempt themselves from any come-backs - - that's if they haven't already done so, as they have with experimental injectables.