CNN asks state drug agents to probe One Conrad Murray doctors , One nurse . One doctor referred to medical board . Investigators also visited Klein 's office , where Jackson was seen several times in the weeks before his June 25 , 2009 , death . Attorney General : No evidence to support criminal prosecution . Dr. Jackson already faces a criminal charge .
CNN asks state drug agents to probe One Conrad Murray doctors , One nurse . One doctor referred to medical board . Attorney General : No evidence to support criminal prosecution . Dr. Jackson already faces a criminal charge .