Mary and Susan are nurses working together on a med-surg flo…

Mary and Susan are nurses working together on a med-surg floor at the hospital. Susan overheard Mary talking on the phone at the beginning of their shift about how “wasted” she got last night and how she still felt “a little drunk” this morning. Susan is worried that Mary may not be able to give good care to her patients.  She therefore, has an ethical obligation to protect Mary’s patients according to which ethical principle?