There is inconsistency in the story.  If Yang admitted the reported offense the DA would have a clear case and could successfully prosecute.  So something is fishy in the allegation by the regulatory agency that Yang admitted the acts he is accused of.  For a DA to fail to prosecute a matter of this nature there must be extreme doubt as to whether incident occurred or occurred as reported.  DA's love to prosecute this type of crime.  The story gets headlines.  The DA's name gets cited in media.  Mr. Moran fails to provide the DA's side of the story.  Perhaps Mr. Moran is biased.