LOS ANGELES (KTLA) -- After a long delay, testimony resumed Wednesday in the involuntary manslaughter trial against Michael Jackson's personal physician, Dr. Conrad Murray.

Dr. Steven Shafter, who is likely the prosecution's last witness, took the stand on Wednesday. Shafter is an anesthesiology and propofol expert who helped develop national guidelines for the drug.

Testimony was suspended last Thursday afternoon to allow Shafer to attend a medical convention, and again Monday because Shafer's father died.

On Wednesday, Shafter testified that Murray committed at least a dozen "egregious" violations in his care of Jackson.

He said Murray behaved more like a staff member than a doctor.

"What I saw was a patient who stated what he wanted... And I saw Conrad Murray said, 'Yes. Tell me what you want and I'll do it.'" Shafer said.

Shafter said that it was Murray's responsibility as a physician to tell Jackson he would not give him propofol to help him sleep.

"Dr. Murray should have said, 'Michael Jackson, I am not giving you propofol. I am not giving you anything. You have a sleep disorder and you need to be evaluated.'"

Shafter also took issue with the amount of propofol ordered by Murray in the months before Jackson's death.

He said his calculations showed that more than 4,000 gallons of propofol were shipped to Murray, translating to about 2,000 milligrams per day.

Murray told police in an interview that he gave Jackson 25 milligrams of the drug to help him sleep before his death.

Earlier in the day, Shafer walked the jury through how proper sedation using propofol should be handled.

A video prepared by Shafer's colleague, a Canadian anesthesiologist, demonstrated in detail how propofol -- the surgical anesthetic that killed Michael Jackson -- is safely used in operating rooms.

Previous expert witnesses have criticized Murray's use of propofol in Jackson's home, without proper monitoring and resuscitation equipment on hand.

The video showed on Wednesday demonstrated the precautions taken at hospitals while using propofol, including using a mechanized pump to deliver the correct dosage.

Doctors in scrubs and gloves meticulously checked medical tools and machines that witnesses say were absent in the bedroom where Murray gave Jackson propofol.

Shafter paused the video several times to highlight the way's Murray's care of Jackson deviated from the proper protocol.

In the video, the patient -- really an actor -- stopped breathing, and the words "CALL FOR HELP!" flashed across the screen.

"The first thing you say, the first thing you do is call for help," Shafer said.