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. Why is the state criminalising normal childhood behaviour? Like hundreds of schools in the state, and across large parts of the rest of the US, Fulmore Middle [school] has its own police force with officers in uniform who carry guns to keep order in the canteens, playgrounds and lessons. Each day, hundreds of schoolchildren appear before courts in Texas charged with offences such as swearing, misbehaving on the school bus or getting in to a punch-up in the playground. Children have been arrested for possessing cigarettes, wearing inappropriate" clothes and being late for school. 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. What was once handled with a telling-off by the teacher or a call to parents can now result in arrest and a record that may cost a young person a place in college or a job years later. "We've taken childhood behaviour and made it criminal," said Kady Simpkins, a lawyer. "They're kids." The very young are not spared. Texas records show more than 1,000 tickets were issued to primary schoolchildren over the past six years .