but i'll also say this, that the absence of a criminal record does not mean that criminal behavior is absent. it simply means that they weren't caught for what they did. so we always look for a history of domestic violence, we look for acting out against animals, other people, so the fact that we don't have a formal criminal record may not be indicative of anything other than there is still criminal behavior there but there were no arrests. >> mary ellen, one of the facts of this case that has struck a lot of people, the family of the victims included, is that it took so long to get to an arrest, in this case seven weeks. what does it tell you that it took that long to make an arrest in this case? >> this is a case that had an awful lot of physical evidence that had to be analyzed, and it had to be analyzed very carefully, because the physical evidence ultimately the dna will