Surge in illegal metal detecting at Hadrian's Wall

'There has been a spate of ‘nighthawking’ incidents at Roman Wall sites at Corbridge, Housesteads and Steel Rigg over the past three years'. (Historic England)

This is quite interesting as a drop in numbers of incidents at precisely Corbridge was not so long ago used as 'evidence' that the PAS was (somehow, it was not explained how)  responsible for an alleged 'drop' in illegal artefact hunting.