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In 2014, in the second edition of the Handbook of Security, I made reference to technology, how could one not? Technology features more prominently now, it is core to all security measures even ones that were traditionally seen as physical. For example, the work of security officers is increasingly enhanced by technology from body worn cameras to providing access to more information about crime generally and even specific incidents, sometimes ahead of arriving at the scene to deal with them. Technologies are becoming more connected which both enhances their capabilities but generates new security risks all of their own as concerns about ‘the Internet of Things’ so poignantly highlights (Blythe and Johnson 2019; see chapter by Johnson et al in this Handbook). Indeed, in the security world there has sometimes been a tendency to treat technology as an unqualified good, but it isn’t, it helps offenders too (Gill et al. 2019), and it raises all sorts of privacy issues and these have also grown in importance over the last 16 years