No one comes to a called-in top medical emergency alone. There is a standard procedure. It takes only seconds to look on the front of the refrigerator, the kitchen usually being near the front door where they enter. I didn't say someone searches through the whole house for a DNR. I said they look on the refrigerator.
That someone also looks in the medicine cabinet. It's just part of assessment. A person begins assessment+ then proceeds when they know what exactly they're dealing with.
You should get legal advice, available online, for your state to get specifics+ clarity.