Read the Governor's directive. It will provide the OPT-OUT you need. It will state -- "Should not wear a Face Covering due to ANY medical or behavioral condition or disability (including, but not limited to, any person who has trouble breathing,..." All of the democrat States that have made wearing face masks in public "mandatory" have this exemption in their covid-19 directive. All of this is an illusion because governors to not actually possess the authority to mandate wearing masks.  The exemption of "ANY MEDICAL CONDITION" is your opt-out. Furthermore, the exemption of "ANY BEHAVIORAL CONDITION" is also your opt-out. If you have ANY disability, you can use this also to opt-out. You do not have to prove it to them. Of 4 States -- CA, NV, AZ, and NC none of them require "evidence" of a medical condition. NC specifically states proof is not a requirement. The reason for this is that the Governors know wearing face masks cause medical conditions. Lawsuits would soon prevail successfully.  Just tell any one demanding you wear a face mask, you are exempt because of a medical condition. Say nothing more than that. This is all they need to know. EVERYONE can use the Exemption as their opt-out. OSHA considers N95 and surgeon masks as "respirators". The cloth masks are not classified by OSHA because they are absolutely worthless. All face masks, whether respirator-type and cloth, restrict oxygen intake within minutes of wearing them and very soon it will fall below the 19.5% limit OSHA has set for safe use. Anything less than 19.5% is harmful to the individual wearing them. Any individual wearing a face mask and is below the 19.5% oxygen threshold is a walking time bomb. Many people wearing masks are unaware they are actually doing harm to their own health. Restricted oxygen is indeed "trouble breathing". It acts as a deleterious chain of events leading to heart, behavioral/cognitive/immunological issues.