Kleck has a good track record of honest research. I'll take his word for it at this point especially with the author hiding his research.“The Lankford ‘study’ is nothing more than junk science disguised as research, and never should have been published in a responsible scholarly journal,” Florida State University criminology professor Gary Kleck told FoxNews.com.
Reminds me of the beginnings of the debunking of that book several years ago about how most people in the US settlor days didn't have guns. I can't remember the name of the book or the "researcher" but his research was shredded and his reputation pretty much ruined from what I recall. Perhaps someone else remembers the details.