A prosecution witness will testify ... Dr. Conrad Murray committed "multiple egregious and unconscionable violations" in his treatment of Michael Jackson the day he died ... this according to documents obtained by TMZ.

Prosecutors filed the document because they want to shoot down the defense theory that MJ may have orally ingested the fatal dose of Propofol.

According to Dr. Steven Shafer, "There is a zero possibility that the propofol was orally ingested."

Dr. Shafer believes, "There is almost nothing in Murray's care of Michael Jackson that reflected the actions of a trained physician."