 While the CCRB has the authority to investigate complaints and to determine if misconduct occurred, under the law only the police commissioner has the authority to impose discipline and decide the appropriate penalty.However, on April 2, 2012, the NYPD and the CCRB signed a Memorandum of Understanding (MOU) which conferred on the CCRB the power to prosecute substantiated cases where the board recommended "charges and specifications," the most serious discipline.As a result, the CCRB's Administrative Prosecution Unit (APU) now prosecutes nearly all the cases where the Board recommended the subject officer receive charges and specifications, with limited exceptions.