Dr. Conrad Murray told detectives that he only administered a total of 4mg of the sleep medication lorazepam to Michael Jackson the day he died. Dr. Steven Shafer testified that Dr. Murray must be mistaken, because based on the levels of the drug found in Jackson's blood during the autopsy, Jackson had significantly more lorazepam in his system when he died.

Shafer illustrated the only way Jackson's blood would have the level of lorazepan observed at autopsy is if he got 10 consecutive injections at double the rate Murray claims.

Is it possible that Jackson took more of the medication himself? Or did Dr. Murray administer more of the drug than he said he did?

Watch Dr. Shafer walk through his analysis here:

Complete courtroom coverage of the Conrad Murray trial airs live on HLN from gavel to gavel. It’s also on In Session on truTV from 9 a.m. to 3 p.m. ET every weekday.

Posted by: In Session's Graham Winch