I sobered up for the first time in 1978 - 1985. The last time was 1992 to the present. That's the truth and I've no reason to lie to you or anyone. I've no doubt that many do, but I fail to see the reason for most. One example I am aware of in which a person lied about their sobriety I actually supported them.
They were approached by a parole officer in a twelve step meeting and was told that anything they said in a meeting that she was present in could and would be used against her in a court of law. When that person slipped and immediately got back into recovery, they didn't mention it at meetings and continued to celebrate their old sobriety date. Since they were facing life without parole for a violation, I completely supported their choice to do so. That particular slip was their last one to date and if their current actions and the visible changes in them are any indication, it just may be their last.