If it has a valve for exhalation it is not "safe".
Will get nowhere with that.
https://engagedscholarship.csuohio.edu/cgi/viewcontent.cgi?article=1010&context=jlh
Start at page 295.
IV. IMPLICATIONS OF EXPANDED EXECUTIVE POWERS
ON PUBLIC HEALTH EMERGENCIES
“Silent Enim Leges Inter Arma.” (Law stands mute in the midst of arms.)
Marcus Tullius Cicero
I have to agree with you. Been there done that. Once is enough.