How do I ensure that a search committee won't contact my current colleagues (that are not references) to ask about me?
I used the following language, and I think it had the desired effect.


  Because I am hoping to keep this search confidential, I request that
  you contact my references rather than my current colleagues at this
  time. If I were to become a finalist, I would of course expect and
  invite you to speak to my current department.