'In order to extend mercy, the committee must be convinced that the wrongdoer has a changed heart condition and that he has a zeal to right the wrong and is absolutely determined to avoid it in the future.'
Merrcy only means not to df but discipline is still given in the form of an announcement, etc.
Each case has to be heard but what would convince me is if the person came forward right away and confessed (given that the motive for his confession was good). If the person practiced sin for a period of time, that has to be adjudicated considering if the person was snagged or confessed; and the motive for his confession has to be decided; also to be considered is sadly regret vs repentance because of hating the wrong done, applied to the case. But bottom line, the sinner receives some form of discipline once guilt is established.