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Investigator Elissa Fleak took the stand again Thursday morning in the involuntary manslaughter trial against Michael Jackson's personal physician, Dr. Conrad Murray.

During the tense cross-examination, defense attorney Ed Chernoff accused Fleak of making a number of mistakes, including being sloppy while collecting evidence and writing her report that the medical examiner used to pronounce Jackson's death a homicide.

When Chernoff pressed Fleak about leaving her fingerprints on a syringe located on Jackson's nightstand, she responded, “I typically wear gloves. I always wear gloves at crime scenes."

She was also asked about making revisions to her original report on Jackson's death from 2009. Chernoff implied that she did this to help corroborate with Alberto Alvarez's testimony. Alvarez is a key witness for the prosecution who helped Murray collect Jackson's medications on the day the King of Pop died. However, Fleak said on the stand that she only learned of Alvarez's name about two days ago.