NEW : Doctor was `` present during the search of his home , '' attorney says . Investigators search Dr. Jackson 's LAS VEGAS home , office . Rolodex allegedly gave Conrad Murray propofol in three hours before death , source says . Los Angeles police and DEA agents , carrying search warrants , were `` looking for a lot of things , '' said Assistant Special Agent in Charge Mike Flanagan . Source close to family says doctor administered drug believed to have killed singer .
NEW : Doctor was `` present during the search of his home , '' attorney says . Investigators search Dr. Jackson 's LAS VEGAS home , office . Rolodex allegedly gave Conrad Murray propofol in three hours before death , source says . Source close to family says doctor administered drug believed to have killed singer .