In addition to Walker, five witnesses testified Thursday morning, including officials with cell phone companies and a computer forensic specialist for the Ohio Bureau of Investigation who testified about her analysis of the contents of 17 cell phones examined by police.

CNN: STORY HIGHLIGHTS

The DHS's current cyber-monitoring program, known as Einstein, performs only basic traffic analysis without examining the contents of Internet traffic, Lewis says.

FORBES: Bush's Double-Edged Cyber-Security Plan

Those that we did take were used for radiocarbon dating and palaeodietary analysis, as well as analysis of the gut contents and hair, amongst other items.

BBC: 'These were horrific torture techniques'

Experian, a credit reference agency, commissioned a waste analysis company to examine the contents of 400 domestic bins in Nottingham to show how easy it was for fraudsters to obtain personal information from household rubbish.

BBC: Bin raiding: The growing scourge