Video: Prosecution calls last witness in Sandusky trial

>>> his attorneys are right now in court presenting his defense. they are expected to bring up a psychiatric condition to explain parts of his behavior with young boys . this morning the prosecution dropped one of the charges against sandusky before calling its last witness, the mother of accuser identified as number seven. prosecutors may try to use previously unaired portions of an nbc interview with sandusky last november conducted by bob costas for rock center. on friday a prosecutor from the pennsylvania attorney general 's office offered a full, unedited transcript of the interview and nbc agreed. the interview includes the exchange between costsas and sandusky who claimed he worked with many young people who never misinterpreted his behavior or actions.

>> so it's entirely possible that you could have helped young boy a in some way that was not objectionable while horribly taking advantage of young boy b, c, d, and e. isn't that possible?

>> well, you might think that. i don't know. in terms of my relationship with so many, many young people i would guess that there are many young people who would come forward, many more young people who would come forward and say that my methods and what i have done for them made a very positive impact on their life. and i didn't go around seeking out every young person for sexual needs that i've helped. there are many that i didn't have. i hardly had any contact with who i have helped and many, many ways.

>> now, neither the clip nor the full transcript had been used by the prosecution so far. so what has happened today? let's go to michael isakoff standing by with more. what's the update?

>> reporter: the update, tamron, is this case is moving along more rapidly than any of us anticipated. the judge just said we're adjourned for the rest of the day but that the defense will rest by noon on wednesday and then there will be some rebuttal from the prosecution. there may be wednesday afternoon. closing arguments on thursday. this case may go to the jury as quickly as thursday afternoon. now, the big unanswered question, will jerry sandusky take the stand? the defense had clearly indicated that, signaled that last week, but it is up in the air right now. no hint one way or the other whether he'll go through with that. obviously as in that clip you just played there is a lot of material that the prosecution will be able to cross examine him with.

>> as we pointed out the mother of one of the alleged victims really was the final prosecution witness or one of the very last and then we started to hear from a former coach who worked with sandusky , almost character witnesses, at least from the start, michael. these first witnesses from the defense certainly do not match the emotion and the intensity that we saw from the prosecution's first witness and down to this last alleged victim.

>> absolutely not. they only go so far. the coach and other witnesses have come forward to talk about jerry sandusky 's good reputation in the community, his dedication to kids but they don't go to the evidence in this case. that last witness by the prosecution put on this morning, the first mother of any of alleged victims to testify, very powerful. she broke down, sobbed on the witness stand as she described how she -- how her son would complain about going to jerry sandusky 's house, yet she made him go in the earlier years. she thought it was good for him and she at one point was asked, do you feel responsible for what happened to your son? she held her hands, wept, and cried, yes i do, a very poignant moment in that courtroom.

>> all right. thank you very

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