I was also interested to see how the ethical statement for the MLA differs from the ALA’s statement. Both have similarities, of course – the two statements stress access to information and protection of privacy for patrons. ALA, however, sees its primary duty as ensuring “intellectual freedom and the freedom of access to information.” Its statements uphold that goal, stressing ethical interactions between patrons and librarians which uphold freedom of thought and knowledge.
MLA’s statement also mandates the best possible service to clients and institutions, but a spends a little more time discussing librarians’ duty to the profession itself. I am not sure why this is. I think it might partly have to do with the fact that medical librarians deal with a slightly narrower segment of society in a slightly narrower range of possible positions. That means that the profession itself is a little easier to define in a single place. But I could be mistaken.