The Sexual Exploitation of Children: Can You Recognise the Signs? The Association of Chief Police Officers (ACPO) and the National Policing Improvement Agency (NPIA), 2012. Training film. Available free: http://www.cse.siyonatech.com; http://www.youtube.com/watch?v=k14eDgD597o This article is from: The Sexual Exploitation of Children: Can You Recognise the Signs? The Association of Chief Police Officers (ACPO) and the National Policing Improvement Agency (NPIA), 2012. Training film. Available free: http://www.cse.siyonatech.com; http://www.youtube.com/watch?v=k14eDgD597o