A law enforcement trainer who tells cops 'the best sex happens after you've killed someone' has been canceled from speaking at session for Michigan police suffering from PTSD. Dave Grossman, a retired Army Lieutenant Colonel who claims to have trained law enforcement officers in all 50 states, faced a stinging backlash after a video clip of his controversial training sessions - dubbed killology seminars - went viral recently. In the clip, taken at a police training session, Grossman says: 'Killing is just not that big a deal.' He goes on to say that cops can experience 'the best sex' after...