West Coast Regional Council staff have started wearing cameras when they make site visits to menacing members of the public.
Consents and compliance manager Jackie Adams revealed the system when asked yesterday by Cr Allan Birchfield if staff notified farmers and miners of impending visits.
"I have a report that they are arriving without forewarning," Cr Birchfield said.
Mr Adams said they had told a couple of people they would not be warned of compliance visits because health and safety issues were involved.
The council did not want to "give them time to get wound up", and threaten violence.