Did Jackson take other drugs on his own?

LOS ANGELES The night before he died, Michael Jackson was injected with sedatives as well the anesthetic Propofol. The report comes from an unnamed law enforcement official who spoke to the Associated Press. The drugs cited are benzodiazepines, which include Xanax and Valium. The drugs are commonly used in surgery, but when used with Propofol, it's a delicate balance.

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"Those levels by themselves may well be within safe limits, but given together they might theoretically produce unsafe effects and side effects," said Dr. Jayson Hymes, an anesthesiologist and addiction specialist.

Dr. Hymes says another issue may cloud the investigation and even clear Dr. Conrad Murray from criminal prosecution. Michael Jackson could have taken benzodiazepines on his own.

"The possibility exists that these medications could be prescribed by multiple physicians, perhaps even at the same time," said Dr. Hymes.

Investigators found evidence Jackson used fake names.

"Physicians may not know about each other, may not even know that the same person is getting those medications," said Dr. Hymes.

Dr. Hymes says a urinalysis would have detected the abuse.

"Are they taking the medication we are giving them? Are they taking other medications other people are giving them?" said Dr. Hymes.

Dr. Hymes says investigators may never have answers to some key questions.

"Who gave what to whom when that caused this problem?" said Dr. Hymes.

Dr. Conrad Murray's attorney released the following statement Friday:
"We are not going to be responding to any accusations from unnamed sources."

Jackson's concert promoter, AEG, has reportedly lost more than $17 million over his untimely death. The company had taken out an insurance policy on the pop singer, but it prohibits any payout if his tour cancellations are related to illegal drug use. That drug use can only be proved by Jackson's autopsy report.

The release of the autopsy report has been delayed twice. There is word that the Jackson family has the results of both their private autopsy and the coroner's exam, and that they have inquired about having a third round of testing.

Eyewitness News Reporters Miriam Hernandez and Subha Ravindhran contributed to this report.

• Video: Complete video coverage of Michael Jackson
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