This is an interesting comment from Mr. Koenig.
Certification is required in all public and public academic libraries in the state of Washington.
Were it not, my office would not be certifying an average of 300 librarians per year. Washington state law reads that any library serving a population of 4,000 population must have at least one certified librarian on staff. To be absolutely correct, it is advisable for anyone coming into the state and wanting to work in a public or academic library get certified so that it does not act as a block to any employment opportunity that may come along.