According to State of Washington v. Martin and Hamlin the following is the criteria:
The earlier Court of Appeals, Division I, case of State v. Buss53
announced three requirements which must be satisfied before communications
between a member of the clergy and a penitent can be considered privileged
under RCW 5.60.060(3): (1) the clergy member must be ordained;54 (2) the
statements must be made as a "confession . . . in the course of discipline
enjoined by the church";55 and (3) the penitent must be constrained by
religious obligation to make the confession.
SO. 1. Ordained ministers count.
2. As long as it is stated as a confession to the Ordained minister they are legally bound to keep it private. (Does this happen? No because most witnesses do not state it as such. They do not walk into the the elders and say, I have a confession to make and as your paritioner you are bound by law to keep this confidential.)
3. This is where it gets tricky: It would depend on how you define CONSTRAINED!! Websters: forced, compelled, or obliged.... SO it would depend on how the court sees your case. Did you feel forced, compelled or obliged to confess?? I would say most JW's would have a good argument to say that yes they did. Plus the WT society doesn't want to pay tons of court costs to argue a single definition just to see which way the court would lean. So they will respect your wishes if you state your case in this way.
Most poor JW's though do not realize they have this option or think it is automatically invoked. They ask to speak to an elder and although they may say "I have been smoking" or "I committed fornication" unless they state it as a confession, they arent' covered because unlike Catholics, JW's do not have a confessional or any other formal way of confession. As far as the elders are concerned it is a regular JW speaking to an older, wiser JW. However if everyone preceeded thier statement with the statement that "What I am about to tell you is a confession from a congregation member to an ordained minister and is therefore priviledged", then if the elder if he told anyone other than the standard JC committee could very well be sued for slander if the confession was spread around.