Friday was no different.
A former girlfriend of Murray's, Sade Anding, said she was on the phone with him the morning Jackson died when Murray suddenly seemed to stop paying attention, and there was a commotion in the background.
"It establishes," says CBS News legal analyst Trent Copeland, "that, during the time when he should have been monitoring the vital signs of Michael Jackson -- his respiration, his heartbeat -- his vital signs, that he was engaged in texting, communicating with the girlfriend -- engaged in fairly frivolous behavior."
All week, with members of the Jackson family in court, security guards, paramedics and the emergency room doctor testified that Murray did not administer CPR properly, wasted precious minutes before calling 911, and withheld information about the singer's medication, Tracy points out.
Prosecutors argue the doctor was desperate to cover up evidence that he was giving Jackson the powerful sedative Propofol.
Jim Moret, chief correspondent for "Inside Edition," told CBS News, "The prosecutors are laying out a case where Dr. Murray is acting in an inconsistent way and in a way that suggests a consciousness of guilt."
The high-profile preliminary hearing is expected to wrap up next week.