The use of naloxone by officers to reverse the effects of opioid overdoses is being trialled by several UK forces, having saved hundreds of lives in the US and Canada, and debates are ongoing in Australia and New Zealand – but not everyone believes it’s the best way forward; Policing Insight Contributing Editor Tina Orr Munro takes an in-depth look at the impact the medication can have, how and where it is being used, and the barriers to a wider roll-out.