I believe Nagin and Black send their disagreements they had to Lott on the method. Lott happened to agree with them and fixed it and addressed it in his 2nd addition.
I know the Johns Hopkins studies are funded as well by the ASD(Anti Self-Defense) Joyce Foundtion.
HCI says they are detremental, but Doug Weil says there is no effect? That doesn't make sense to me.
Dan, I don't have the original reference handy, but I'm sure my categorization of Doug Weil in the middle category was due to a statement that Lott has not demonstrated benefits. The middle column is actually two very similar things: a) benefits don't exist; or b) benefits are unproven. In any event, caveats & qualifications above notwithstanding, (esp. re: Dezhbaksh) I've seen no significant evidence presented by Weil (or any other competent researcher) of any meaningful detrimental effects, unless Weil the mostly-anonymous author of the HCI "study."