Conrad Murray's defense team calls first witnesses – CNN contributor Paul Callan on what to expect

The defense in the Conrad Murray trial called their first two witnesses to the stand yesterday, Dr. Alan Metzger and Cherilyn Lee, a nurse, after the prosecution rested their case.

Both witnesses were called to testify that Michael Jackson had asked them for intravenous sleep medicine. The defense is trying to paint Jackson as a desperate addict and to build the case that he was shopping around for a doctor who would administer propofol.

Today on American Morning, Paul Callan, CNN legal contributor, discusses the strength of the prosecution's case and weighs in on what can be expected from the defense in the coming days.