Most countries do not use body scanners, he said, preferring to use a combination of metal detection and technology that can identify explosives.

CNN: TSA removes body scanners criticized as too revealing

The EEA suggests that the best way to tackle the threats posed by invasive species was through a "combination of preventative measures, early detection and rapid response to incursions, with permanent management only as the last option".

BBC: Report tracks threats from Europe's alien invasion