One of the most chilling moments of the Conrad Murray trial was the playing of that slurred audio recording of Michael Jackson, allegedly taped by Dr. Murray.

For many, that recording is proof that the King of Pop suffered from substance abuse. However, Dr. Murray alleges that he had no idea that other doctors were supplying MJ with drugs, in his jaw-dropping statement to police.

Dr. John Dombrowski, an anesthesiologist and pain-management specialist, appeared on Dr. Drew’s HLN show Tuesday night to discuss this issue.

“When a patient comes to me in the operating room, I have to know every medication he or she is on, so I know how the anesthetic will interact with the individual,” Dr. Dombrowski explained. “We as anesthesiologists are personally responsible for that patient … you have to know the medication he is getting. If you use propofol, you will know how to monitor the patient and how much to give the patient.”

Ryan Smith, host of truTV's In Session, asked if that meant Dr. Murray may have failed Jackson by not getting to know who Jackson was interacting with ... affecting his treatment.

Dr. Dombrowski replied by saying that it’s important to make sure all the medical professionals are coordinating together so they get the right care to the patient.

“When he's [Dr. Murray] providing this level of care to Michael Jackson, he sees what medication is around him,” Dr. Dombrowski noted. “He can't help but notice it. He can pick up the bottle, read what he's taking – my goodness – ‘[say], let me give this physician a call.' We do it all the time as anesthesiologists and people that specialize in pain medicine.”

Dr. Dombrowski ended the interview with another significant point.

“Any time you give anyone an anesthetic, you never leave the patient,” he said. “You don't say, ‘he self-administered – he drank it – went someplace else.' I am always there in attendance to find out what goes on. You never abandon the patient at any time.”

Watch Dr. Drew’s HLN show weeknights on HLN at 9 p.m. ET and follow him on Twitter @DrDrewHLN.