In this report, published in 2008, the evidence for three loss prevention technologies (CCTV, EAS and Data Mining) was examined by Professor Beck. Despite its relative age, this report continues to prove to be highly instructive to the loss prevention community, helping to inform many new technology decisions and experimental designs.
In a related study published in 2016, the evidence was again collected, relating to a number of technologies including CCTV and EAS, reviewing whether they were effective in amplifying risk and hence making thieves think twice about stealing from retail stores.
For further information on these reports. https://ecr-shrink-group.com/page/roi-of-technologies