When police officer Kristian White tasered 95 year old Clare Nowland in an aged care facility last year, he said the great grandmother was a threat because she was carrying a knife.  But a jury has found him guilty of manslaughter. Today, we speak with reporter Jason Om who has been covering the case and with criminologist Xanthe Mallett about how police use tasers.  Featured:  Jason Om, 7.30 reporter Xanthe Mallett, associate professor of criminology from the University of Newcastle