dealing with people whose memories can be questioned, things that happened years ago, up against a kind of statute of limit talgss. there's a long time window. and obviously a defendant who has some means and can hire very, very good attorneys. >> this was a really difficult case for the prosecution, chris. you're absolutely right to point to the age of the crimes. normally, federal crimes have typically a five-year statute of limitations. that means you can only prosecute within five years of the events occurring. but there's an aggregation of that statute of limitations for crimes involving children and for sex crimes involving children. and that means prosecutors were able to bring these older charges, but that came at a cost. with the defense putting on an expert witness who talked about the unreliability of aging memory are, so a very difficult case and a very good result for prosecutors. >> we should back up, julie,