In 2015, as Europe reeled under the first of a new wave of mass casualty attacks, technologies designed specifically to screen large numbers of people entering venues started to emerge. Some of these systems provided automatic and real-time screening for thousands of people an hour without the need to divest or remove bags and outer garments. A range of active and passive millimetre wave scanners was developed to detect explosive devices and weapons. No longer confined to detecting metal, now these systems could find low metallic IEDs and bulk explosives as well. They offered a practical solution for protecting crowded places but no longer looked like traditional checkpoints and called for a different way of doing things. At last, there were practical and bespoke solutions that were more efficient and cost-effective, and which enhanced the visitor experience. However, the security industry is a traditional and naturally risk-averse organisation. Whilst far from ideal, the initial approach derived from aviation security had become established and accepted as the norm. In these circumstances, there were no burning drivers for change, and diverging from the accepted approach could be considered a risk.