The prosecutor should not be allowed to bring victims of prior crimes to testify unless they have true knowledge about the present crime.  Forcible rape is a serious crime and one that unfortunately elicits strong emotion.  But a trial is about determining facts not eliciting emotion.  The DNA evidence is a strong indicator of guilt but it is not infallible.  It will be interesting to see how convincing his alibi witnesses are.  When it is over, the jury hopefully will decide on the basis of fact related arguments presented by prosecution and defense.  If indeed this person has committed three forcible rape acts in series, he is indeed a good candidate for life imprisonment even though it will cost us millions of dollars.  If he is reasonably convicted and it was up to me, I would have him surgically neutered and perhaps remove one leg so that he no longer has the mobility to be a threat nor the hormones, but could still work to pay for his own food.