>> Bill Cosby may have to hear from as many as 13 accusers in his upcoming sexual assault trial. Prosecutors asking a judge at a hearing on Tuesday to allow testimony from the women to show the comedian's pattern of behavior. Reuters correspondent Joseph Ax was in the courtroom in suburban Philadelphia.
>> Normally, under criminal law you can't as a prosecutor bring up what's called prior bad acts as evidence against the defendant. But there exceptions to that rule. And the prosecution is arguing that the women will testify that they were assaulted in the same way, that you can show that the defendant acted as part of a pattern of behavior or plan over and over.
That sometimes you're allowed to show evidence of prior bad acts but it's an uncommon exception and it's an uphill battle for the prosecution.>> Cosby faces three counts of felony assault for allegedly drugging and having sex with Andrea Constand, a former basketball manager at his alma mater in 2004.
Lawyers for the 79 year old hoping the judge will throw out some key pieces of evidence including parts of a deposition he gave and a 2005 lawsuit brought by Constand. The defense also wants to block a recorded phone call in which Cosby tells Contand's mother he felt like a quote dirty old man with a young girl.
More than 50 women have accused the 80's sitcom star of sexual assault, but most fall outside the statute of limitations for prosecution. Constand's case is the only one so far to result in criminal charges. Cosby could face up to ten years in prison if convicted. The judge on Tuesday set a tentative trial date of June 5th, 2017.