This chapter presents findings from a thematic analysis of data gathered through semi-structured interviews. The interviews were conducted with human trafficking detectives and other stakeholders responding to harms related to the sex market and human trafficking. Its primary empirical contribution consists of a detailed analysis of how online technologies are used within the sex market—particularly in relation to criminal networks—and the principal role of OSINT in sex trafficking investigations. It also highlights several conceptually important themes relating to victim experiences of exploitation and the process of policing the sex market.