 However, as criminal science became more sophisticated he kept up with the times taking advantage of modern scientific crime analysis, forensic techniques and the benefits of a new computerized age.Still, at times he simply fell back on that "dogged determination".In the Bonin case, although the killer was in custody, the DA's office was having trouble building a case, until one day Bonin received a letter from the mother of one of his victims begging him to tell her what happened to her son.