More than 100 cases of children taking knives into South Yorkshire schools have been recorded over the past three years, according to police figures.
The data, which was obtained under the Freedom of Information Act, showed that just three per cent of cases resulted in charges or a court summons being issued.
South Yorkshire Police said it took a "robust approach" to those found carrying weapons.
The statistics were published weeks after the fatal stabbing of 15-year-old Harvey Willgoose at a Sheffield school on 3 February.