CNN  —  In a quiet corner of Glasgow’s East End, a radical public health experiment is underway. For the first time in the United Kingdom, people who inject illicit drugs such as heroin and cocaine can do so under medical supervision – in a safe environment and indoors. No arrests. No judgment. No questions about where the drugs came from – only how to make their use less deadly. The facility, known as the Thistle, opened in January amid mounting political and public health pressure to confront