Michael Gove challenged over his cocaine use as he reveals ban on laughing gas The IndependentNitrous oxide: Possession of laughing gas to be criminal offence BBCMichael Gove defends government plans to ban sale of laughing gas Guardian NewsLaughing gas ban ‘will not stop young people using it’, say experts The IndependentNitrous oxide to be banned under plans to clamp down on anti-social behaviour Sky News