This 1 hour lecture published on 24 Nov 2011 is from a series of Sidney Ball Memorial Lectures at Oxford University.
Professor Mark Lipsey (Peabody Research Institute, Vanderbilt University, USA) discusses evidence-based interventions in Juvenile Justice: Concepts, Research, Practice, and Frontiers. The lecture can be downloaded and kept as either a 30MB mp3 audio or 521MB mp4 video.
This lecture is published with a licence that allows it to be edited, for example if you only want to play a short passage. However, I was frustrated that Mark Lipsey repeatedly refers to a diagram that the viewer is not shown!
Link: http://podcasts.ox.ac.uk/units/social-policy-and-intervention
cyp-media.org 