Saying some details needed to be worked out, the Board of Selectmen on Tuesday deferred its vote to approve an updated policy designed to help public officials report wrongdoing. The selectmen during their regular meeting discussed a revised version of New Canaan’s “whistleblower policy” with Tucker Clauss, chairman of the Board of Ethics, the appointed body that’s been developing it. First issued in 2012, the policy needed to be updated so that it covered not only Town Hall but also the Board of Education, Clauss said at the meeting, held in Town Hall. The language of the existing policy also needed to be clear that it didn’t override other requirements, such as for teachers to report suspected abuse or neglect to the appropriate legal and regulatory authorities, Clauss said. There’s also a provision in the policy now in place that deals with immunity from criminal prosecution.