The Police Association says a new court decision on photographing people in public could "dramatically change" how police do their work.
The Court of Appeal has ruled a man who had his picture taken by an officer during a random police stop was unlawful and breached his rights.
It says he had a reasonable expectation of privacy.
But Police Association President Chris Cahill says the decision appears to ban officers from taking pictures of people in public, which would lead to fewer crimes being solved.
He spoke to Corin Dann.