Tim Lopez testified that Murray bought four shipments of the powerful sedative between April 6 and June 10, 2009. Murray also ordered muscle relaxants, saline bags and dozens of tubes of skin bleaching cream.
Murray, who has admitted to giving the singer propofol, is charged with involuntary manslaughter. The cardiologist has pleaded not guilty, and his attorneys say he did not give the entertainer anything that should have killed him.
However, Murray has told police he was concerned Jackson was addicted to propofol, and that he was trying to wean the singer from it.
Jackson died on June 25 in his Holmby Hills mansion with Murray present. The coroner's office ruled the cause of death was acute propofol intoxication complicated by benzodiazopene sedatives. A dozen vials of propofol were found in Jackson's bedroom after his death.
Stephen Marx, a forensic analyst with the Drug Enforcement Administration, testified on Monday about data recovered from Murray's iPhone.
The data included a lengthy text in which Murray made an appeal to Jackson's insurance company and dismissed press accounts about Jackson's frail health. That text was time-stamped 11:21 a.m. on June 25.
For the next 40 minutes, according to prosecution witnesses, Murray was talking or messaging, unaware that Jackson's heart was failing until he noticed breathing had stopped.
On Friday, witnesses detailed phone calls that Murray made to several women around the time of Jackson's death.
Among other things, prosecutors are trying to prove Murray was distracted when Jackson stopped breathing. They also hope to prove that Murray botched CPR efforts and that the singer was dead before help was summoned.
The hearing to determine whether there's enough evidence for Murray to stand trial is expected to last three to four more days.
If Murray is found guilty, he could face up to four years in prison.
The Associated Press contributed to this report.