**1. Introduction**

The investigation of child sexual abuse (CSA) has become increasingly complex with technological advances and the widespread use and availability of the internet. In the United States, the creation and trafficking of child sexual abuse material (CSAM) online is among the fastest growing illicit online industries (Binford et al. 2015). Prior to the digital age, CSAM was typically shared among perpetrators through the physical sharing of hard-copy images either by mail or face-to-face encounters. Unfortunately, the internet has facilitated offenders' ability to exchange and distribute CSAM, as well as evade detection by law enforcement.
