Technology for preventing human trafficking has been developed by an aerospace company in Europe.

The Cyber Division of the U.K.-based company Leonardo developed a detached sensor that forms an electromagnetic field (EMF) through which vehicles at border crossings can pass.

Reportedly, the sensor’s algorithm has been designed to locate the natural electromagnetic signatures unique to humans as vehicles pass through the sensor’s field.

Source: Leonardo

According to the researchers, the range of electromagnetic signatures associated with humans can be detected through a variety of vehicles including heavy goods vehicles (HGVs), refrigerated trucks and International Organization for Standardization (ISO) containers, for instance — all without harming those potentially concealed inside.

Already, the technology has been deployed to four border crossings throughout Europe and the team expects that number to grow in the future.