Four paragraphs from the BBC News repot, quoting Metropolitan Police Commissioner Sir Mark Rowley: "It's really important we're deploying it where there's an intelligence basis to do so," he told board members. "That's one of the safeguards - that you're not using it as mass surveillance tool - you're using it in particular places where there is intelligence based to say this may actually make people safer." Sir Mark added that although there may be a case for using the technology at future protests, it would need to be balanced with freedom of speech concerns, as it could have a "chilling effect". "And the intelligence picture at the weekend - that we had before the event - didn't justify that," he added.