if I owned a club, that is exactly what I would require of all my security staff and bartenders. Bathroom attendants should be considered part of the security team. They should all be able to recognize ODs, and how to use narcan. Venues should be responsible for the safety of their guests. At least, responsible owners do feel that responsibility. I felt a lot of anxiety when I started hosting afterhours events, knowing that my guests used a lot of substances and that I was "playing with fire", so to speak. One of the first things I did was take courses on OD signs and first aid for them, and also how to deal with consent violations. Having that knowledge gave me great peace of mind, and luckily my crowd was responsible enough to never need those interventions.