The Federal Reserve has not yet complied with grand jury subpoenas issued as part of a criminal investigation of Fed Chair Jerome Powell by federal prosecutors in Washington, D.C., a person familiar with the situation told CNBC on Wednesday. The probe of Powell is continuing, according to that person, who spoke hours before the Fed is set to reveal whether it will cut interest rates for the fourth time in recent months. It is not clear when the deadline is for the Fed to turn over documents