A former head teacher who set up random pupil drug testing at a school in Kent has been giving his advice and experience to America's drugs tsar.
Peter Walker spoke with the White House's director of drugs policy
Peter Walker was invited to Washington by John Walters, a director at the White House's Office of National Drug Control Policy.
They spoke about the controversial scheme Mr Walker set up at The Abbey School in Faversham in January 2005.
Mr Walters said he was impressed at how potential drug abuse was tackled.
"I was pleased to see that both the adults and the young people in the school had come together for the sake of the reputation and the integrity of the school," he said.
"It was making a difference in the surrounding area in terms of crime, as well as in the pride [of the school] and the improvements in learning that are taking place."
Mr Walker said: "They asked to see me, they wanted to listen to what I've got to say and if it proves of benefit to them, then fine."
Only one pupil tested positive for drugs during the scheme and Mr Walker said it also helped the school achieve its best ever GCSE results.