A CPS Spokesperson said:
“The DPP received a letter from Tom Watson MP in May 2014. The majority of the concerns raised by Mr Watson were operational matters concerning the police. As such, the DPP simply confirmed to Mr Watson that she would forward his correspondence on to the police to address. The CPS has no power to direct the police in operational matters, including the conduct of a criminal investigation, and the decision to interview a suspect is a decision for the police alone.”