"The software provided an efficient and effective way of picking known offenders out of a crowd -- something that officers would previously have done using paper briefings," chief superintendant Chris Haward says. Leicestershire Police has been trialling NEC's NeoFace software for some time now -- it was the first UK force to adopt the technology last summer and plans to use it for suspect identification and developing new lines of enquiry. The sticking point at Download, of course, is not just that the technology was used in the first place, but that attendees weren't told about it either before or during the festival.

[Image Credit: Ollie Millington/Redferns via Getty Images]