No Visible Trauma: Hot Docs' free 'For Viola' screening series calls out what may be Canada's most lethal police force By Liam Lacey Read More ReviewJim SlotekMarch 4, 2021Police killings of Blacks, Black Lives Matter, Documentary No Visible Trauma, Marc Serpa Francoeur, Robinder Uppal, Godfred Addai-Nyamekye, Calgary mayor Naheed Nenshi, Roger Chaffin, Calgary Police Force killingsComment