CDC Gun Violence Study Didn't Give Obama White House Outcome It Wanted - Investors.com Among other findings, defensive use of a firearm is at least as frequent as offensive uses. Persons injured with their own handgun used defensively are less common than persons using other defensive means. Gun turn ins are ineffective. No evidence that restrictive gun laws decrease gun crime. I know, stuff we all have figured out for a while, but it is great that the CDC is concluding it as well.