Technology acceptance in policing is under-researched, yet mobile devices are widely implemented across UK police forces. The paper validates a mobile technology acceptance model (M-TAM), developed in a single police force. It shows that the M-TAM is transferrable to other UK police Forces, and potentially worldwide. The influence of local supervision and fit of technology to roles and tasks are shown to be the most influential factors. Factors beyond the technology itself, such as the influence of peers and involvement of operational officers in technology investment decisions, must be considered to accommodate the strong cultural barriers in policing.