If you haven’t taken a look at the FirstResponder.gov website in awhile, recommend spending some time there. The site has links to some of the information that used to be on the Lessons Learned Information System (LLIS). There are reports on the use of social media in emergency management, and a Body-Worn Video Cameras for Law Enforcement Assessment Report, as well as regular updates on DHS Science and Technology (S&T) projects.
DHS S&T