But Ch Insp Stuart Walne, head of roads policing for South Yorkshire, has warned of "fundamental operational difficulties" with the scheme.

BBC: Yorkshire M1 four-lane scheme 'could cost lives'

Last week a Washington pressure group, the Project on Government Oversight, released a Pentagon report from last year setting out operational difficulties with the Predator.

ECONOMIST: Unmanned aircraft

Ms. ROBIN JARVIS (Superintendent of Schools, New Orleans): Those types of things create unusual operational difficulties that really diverts your attention away from the instructional role.

NPR: New Orleans Hires Veteran to Run City's Schools