A Denver judge has restricted cops from using tear gas and rubber bullets on protesters, saying smashed windows and graffiti are a 'fair trade' to prevent demonstrators' bones being broken and their eyesight being lost at the hands of police. US District Court Judge R. Brooke Jackson limited the force cops can use against protesters in a ruling late Friday night, which also included ordering cops to keep their body cameras on at all times. Jackson said the safety of demonstrators and their right to free speech is greater than the need to protect buildings during protests.