http://volokh.com/posts/chain_1202366725.shtml
Of interest to me is a brief that Mr. Kopel wrote on behalf of a number of law enforcement groups. His summary lists some of them as:
Hmmm, I don't see the International Association of Chiefs of Police or the D.C. Metropolitan Police Department in the list. Strange that, hmmm?The Independence Institute brief is joined by a broad coalition of law enforcement: the Maryland State Lodge of the Fraternal Order of Police (by far the largest rank-and-file police organization in Maryland), 29 of California’s District Attorneys, the San Francisco Veteran Police Officers Association, the Texas Police Chiefs Association, the Southern States Police Benevolent Association, and many others.
Notably, the lead amici in the brief are the two national organizations of police firearms instructors, the International Law Enforcement Educators & Trainers Association (ILEETA) and the International Association of Law Enforcement Firearms Instructors (IALEFI). The brief explains how widespread civilian ownership of handguns contributes to the efficiency and success of police firearms training.

I haven't read the brief myself yet, but I will be particularly interested in this section:
elbPart III relies on practical police experience to explain why handguns are the best arms for home defense, particularly in an urban area such as Washington, D.C.
Update: I was just scanning through this brief when I noticed that the guy I got some excellent defensive handgun training from, John Farnam, is cited as an authority in the brief. Cool. elb