111107114109230.jpg Conrad Murray is determined on proving his innocence!

The incarcerated doctor wants a key piece of evidence from the Michael Jackson trial retested to prove the King of Pop injected himself with the drugs that killed him, not Murray.

In a motion filed today by his lawyers, Murray has asked an appeals court to test the residue in an 100 milliliter bottle of propofol. Murray claims he was trying to wean the "Thriller" singer off the drug, so he was mixing it with lidocaine. Prosecution expert Dr. Steven Shafer's theory was that the doctor mixed the two drugs, hooked Jackson up to an IV drip, and left the room.

"However, if the residue is 100% propofol, it would absolutely refute Shafer's final contention that was used to prove an IV propofol infusion," the motion states.

Murray's defense team maintains that Jackson self-administered a fatal dose of propofol, in addition to swallowing eight lorazepam tablets while Murray wasn't watching.

The motion asks the appeals court to order the Los Angeles County Coroner to either test the residue or hand it over to a private lab for testing. Murray is currently serving a four year prison sentence for the involuntary manslaughter conviction.