physician, of course.
https://www.safehousephilly.org/frequently-asked-questions#faqsis
How will Safehouse prevent fatal overdoses?
Medical personnel will always be on duty to observe and assess participants in both the consumption room and the post-consumption observation room. Medical personnel will immediately intervene in the event of an overdose, administering oxygen and/or naloxone. No overdose deaths have been reported at any of the more than 120 supervised consumption sites worldwide.[10],[11]