Not that I disagree with Lott, or his book, but liberals have convinced themselves that Lott's work has been "debunked."
Look into using one of Gary Kleck's books instead.
I've heard the same thing and there is at least one individual who is trying to discredit Lott personally and professionally. I haven't read any of Kleck's work but have heard him referenced many times in the CCW debate. A book I found extremely helpful is a collection of personal accounts by individuals who successfully defended themselves with CCW:
The best defense : true stories of intended victims who defended themselves with a firearm. Waters, Robert A.
212 p. ISBN : 1888952970 (pbk.)$14.95 Nashville, Tenn. : Cumberland House, c1998.
Subject Heading(s) : Firearms--United States--Use in crime prevention--Case studies. Self-defense--Case studies.
I will make one caveat about the book--it contains some very graphic material. It is not presented sensationally, its intent is to impress on readers' minds the extreme danger the victims faced. This book is an excellent source of case studies because Waters collected accounts from the broadest cross-section of individuals possible. One of the men interviewed, a Vet from Houston, was an integral part of getting CCW legislation passed in Texas. If you do want to use the book and can't get access to it, let me know and I'll do what I can to electronically transfer the information to you.
I will keep looking for websites. Having only .edu, .gov and .mil sites to choose from is making this quite a challenge. One I'm sure that wasn't lost on your son's teacher.