UK police say sorry for using Tazer on blind man British police have apologised to a blind man on whom officers used a stungun after mistaking his cane for a samurai sword. Colin Farmer was blasted by the Taser, which can deliver a 50,000 volt shock, as he walked along a street in the northern English town of Chorley. Farmer said: "I thought I was going to get mugged. And the next thing I knew, is that a... and without warning I got tasered in the middle of my back. The police force invovled say their officers were responding to reports of a man roaming the streets with a sword. They have apologised to the 61-year-old for what they say was clearly "a traumatic experience." The incident may be being investigated by an independent police watchdog. More about: Arrest, Police violence, United Kingdom