This article considers the question of whether policies that propose to forbid public officials, most notably teachers, from wearing religious clothing in the classroom can be justified by political principles of secularism--specifically, the principle of state neutrality and the principle of state autonomy from religious influence. Two prominent arguments on behalf of an affirmative answer to this question are identified and evaluated, ultimately casting doubt on the cogency of prohibitionist arguments. The claim is then advanced that secular principles are most compellingly understood in educational contexts as principles of professional ethics--that is, as grounds for teacher reflection. To support this claim, we conclude by presenting two scenarios in which teachers face difficult decisions about whether to wear or remove an otherwise obligatory religious symbol. In this discussion, the importance of balance considerations of religious conscience with the value of public trust is emphasized.