Jury deliberations in Bill Cosby sexual assault trial drag on

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Actor and comedian Bill Cosby (C) arrives with spokesman Andrew Wyatt for the fourth day of his sexual assault trial at the Montgomery County Courthouse in Norristown, Pennsylvania, US June 8, 2017.

NORRISTOWN, Pennsylvania - There is still no verdict in actor Bill Cosby's sexual assault trial, after more than 30 hours of deliberations over two and a half days.

The 79-year-old disgraced comedian is accused of drugging and sexually assaulting Temple University administrator Andrea Constand, then 31, at his home near Philadelphia in 2004.

The jury in Norristown, Pennsylvania, deliberated into Wednesday night after reviewing testimony from a police officer who interviewed Cosby about the incident in 2005.

Constand is one of dozens of women who have accused the star of the 1980s hit TV comedy The Cosby Show of assaulting them, often after feeding them pills and alcohol, in a series of incidents stretching over four decades.

Constand's allegations are the only ones to result in criminal charges because the others are too old to allow for prosecution.

Cosby has denied every claim, saying his encounters with Constand and the others were consensual.

The jury has gone back over various accounts of the incident from both Cosby and Constand, asking that trial testimony and key documents be reread to them.

READ: 'I wanted it to stop,' accuser tells Cosby trial

On Wednesday, the jurors heard Constand's trial testimony again, as well as Cosby's statements to police from 2005.

Earlier in the week, the jury revisited the testimony of a police officer who took Constand's initial statement in 2005 and Cosby's description of the night from sworn depositions he gave in 2005 and 2006 during Constand's civil lawsuit.

Defence lawyers at the trial emphasised discrepancies in Constand's statements to police in 2005, in an effort to undermine her credibility.

Prosecutors, meanwhile, used Constand's testimony, as well as the words of a second accuser, Kelly Johnson, to portray Cosby as a serial predator.

Johnson told jurors Cosby sexually assaulted her in strikingly similar fashion in 1996.

Cosby himself did not testify.

In his decade-old depositions, Cosby said he gave Constand Benadryl, a common allergy drug whose side effects can include drowsiness.

He called the pills her "friends" without telling her what they were, and admitted to giving other young women Quaaludes, a sedative, in the 1970s.