The US schools with their own police

More and more US schools have police patrolling the corridors. Pupils are being arrested for throwing paper planes and failing to pick up crumbs from the canteen floor.

The charge on the police docket was "disrupting class". But that's not how 12-year-old Sarah Bustamantes saw her arrest for spraying two bursts of perfume on her neck in class because other children were bullying her with taunts of "you smell".

In 2010, the police gave close to 300,000 "Class C misdemeanour" tickets to children as young as six in Texas for offences in and out of school, which result in fines, community service and even prison time.

In one notorious instance in California, a school security officer broke the arm of a girl he was arresting for failing to clear up crumbs after dropping cake in the school canteen. In another incident, University of Florida campus police tasered a student for pressing Senator John Kerry with an awkward question at a debate after he had been told to shut up.