To reiterate the disclaimer, individual circumstances call for an individual Psak. Kedusha wrote on 16 Sep 2010 00:48:
That said, I asked Rav Feldman, Shlita, for some clarification regarding his Psak that someone addicted to these behaviors should not serve as Baal Tefila for the Yomim Noraim. The Rosh Yeshiva explained that if the person has been Poreish from the Aveira and does not want to return to it, he may serve as Baal Tefila for the Yomim Noraim.
Question: What's considered having been Poreish from the Aveira? Does it depend on the number of days clean, the strength of one's resolve, the steps taken to avoid repeating the Aveira, or a combination of these factors? I would think that it's probably a combination of these factors.
I approached the Chasidesh Rebbe/Posek again for clarification too. He said that if someone knows that he is the throes of his addiction, i.e. he has looked at inappropriate 'stuff' & will still continue to look, he shouldn't be a Shliach Tzibur. When a person feels that he is out of it, that he is not gonna look again then he is acceptable again!
"But," I asked, "when a person is addicted he can never be really out of it. There is a guy on the site who is clean 13 years(!) and he still feels like he is standing at the edge of the cliff, ready to slip in an instant. With addictions, we can never 'be out of it'?"
The Rebbe replied that as long as
right now he feels that he won't be looking again, he is a good candidate to be a Chazan. "
Al m'nas she'ani tzadik gamur works in an instant."