Matt Blaze's
Science, Security, Curiosity
Professor Blaze Goes To Washington
Hearing on "ECPA Reform and the Revolution in Location-Based Technologies and Services".

I'll be the first witness at this morning's (6/24/10) House Judiciary Committee hearing on ECPA Reform and the Revolution in Location-Based Technology, which, for DC locals, will start at 10am in room 2233 of the Rayburn building.

My testimony [pdf] will focus on the technical: how modern cell phones and wireless services calculate location, and how accurately they can track and record users' positions and movements. This is all in the context of surveillance: when the government gets a pen register order against a cell phone, for example, what information do (or should) they get about the target's location and movements compared with other kinds of tracking technology?

Other witnesses will include (among others) a special agent (from the Tennessee Bureau of Investigation) who does electronic surveillance, and a federal magistrate judge who has to sort out the legal issues when the government requests tracking information about a suspect. The hearing promises to be an interesting glimpse into how location tracking actually works in criminal investigations.

No idea if the hearing will be shown via a webcast or C-SPAN coverage.

Update 6/28/10: The hearing was interesting, and I especially enjoyed Chairman Nadler's line of questions to me about how the technology works and about the records kept by carriers. Unfortunately, video of the hearing doesn't appear to be available online anywhere, at least at the moment.
Update 5/16/12: An updated version of my testimony is available at, as a statement for the record at a house hearing on the "GPS Act".