People vs. Dr. Conrad Murray -- LAPD Detective Testifies

Defense attorney Ed Chernoff came out swinging in court today ... insisting LAPD Detective Scott Smith took shoddy notes during his search of the medical bags found in Michael Jackson's closet.

Smith -- who introduced Murray's 2-hour police interview tape on Friday -- continued his testimony today, admitting his notes did not mentioned finding a Propofol vial inside the IV bag.

Smith also confirmed MJ's house was never locked in the days following the singer's death -- which, the defense will argue, may have contributed to evidence-tampering.