By Jim Melwert

NORRISTOWN, Pa. (CBS) –– Bill Cosby is back in a Montgomery County courtroom today, for a series of pre-trial motions in relation to sex assault charges against the 79-year-old entertainer.

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Today’s hearing is the first of four days set aside by the judge hearing Bill Cosby’s case.

Three motions to be argued, the first, Cosby’s attorneys want a deposition he gave thrown out because of what a former DA claims was a promise never to prosecute him on these allegations.

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Second, a request by prosecutors to introduce prior bad acts — 13 women who they claim were assaulted in a similar fashion by Cosby.

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Third, Cosby’s attorneys say charges should be thrown out, saying their client’s constitutional rights were violated as prosecutors waited too long to bring charges.