“A recent Mayo Clinic study points out that mass shooters tend to meticulously plan their crimes weeks or months in advance, undermining the idea that the mentally ill simply “snap” and go on shooting rampages while also complicating the notion of effective gun control through gun registries, since a methodical planner has plenty of time to obtain weapons through illegal channels.” – Zach Weissmueller, The Truth About Mental Illness and Guns [at reason.com]