'Knives have been glorified on social media'
Former teacher Emlyn Jones, who now runs a security firm, said more knives are being carried into schools because young people think it is cool, and they make them feel safe.
Mr Jones said scanners, metal detectors and security guards could be introduced at the gates but "you're never going to stop everything coming in".
He said: "If someone wants to have knives in school, they could throw it over a hedge or hide the knife at night so that's not going to stop everyone bringing a knife to school."
Edited by Tink Llewellyn.
