Digital detective hunts for cyber clues at crime scenes
17 September 2013 Last updated at 04:50 BST
If Sherlock Holmes was solving mysteries today rather than in the Victorian era, he might have turned to Paul Reedy for help instead of Dr Watson.
Reedy is a digital detective who says that in a world where most people use smart phones, tablets and computers, almost every crime leaves a digital trace.
Now the manager of digital evidence at the District of Columbia's Office of Forensic Science, the Australian previously worked on a series of international criminal investigations including the hunt for the perpetrators of the 2002 Bali bombings.
He spoke to the BBC about keeping up with criminals, as well as the latest technology.
Produced for the BBC by Felicia Barr; edited by Bill McKenna
Living Online is a series of video features published every Tuesday on the BBC News website which look at how technology converges with culture and all aspects of our daily lives.