This is a good parallel with the aviation industry when SLF board a plane. We dont go up and check the credentials of the flight crew, we place our trust in the CAA/FAA to have done those checks for us. It makes little difference if someone is rehabilitated they have been checked and probably more closely than others - the crew around them are probably more aware to check also. The opportunity on this thread is to discuss the identification prior to a crew member entering the flight deck in an inapporpriate state and how to manage the recovering crew member when they continue their duties. To imply you would not accept a procedure from a certified doctor after knowing they were rehabilitated is to imply you have no confidence in the staff around them - the same applys to the flight deck as they will have the same knowledge you will.
Well said. Combined with your comment on page 1, there isn't much more to say.