I was browsing through the "Flock" book and stumbled across something very interesting. Sometimes I read a post where someone prevented the elders from making an announcement of a person being Disassociated by making legal threats.
Here is what I came across:
UNIT 5 (c) - 141 An announcement is usually made that the individual has
disassociated himself from the congregation, and the
person should be told orally about his position. If for
some extenuating reasons no announcement is made,
persons in the congregation who might be visited by the
disassociated person may be informed privately. The
individual should be treated as one who is
disfellowshipped. See Unit 5 (a), pages 101-2.
It looks like they have express written instructions to violate a person's clergy privilege.