A 17-year-old boy has been sentenced to eight months in custody after he lied to police following the fatal stabbing of a grammar school pupil.
The defendant, Boy A, stabbed fellow teenager Youseff Makki in the heart with a flick knife on March 2 in Cheshire.
Before his death the victim had won a scholarship to the prestigious £12,000-a-year Manchester Grammar School.
Judge Mr Justice Bryan told the defendant: "The backdrop to your offending is depressingly all too familiar - a warped culture whereby the possession of knives is considered to be 'cool'."
He described knife crime as a “cancer on society” and continued: "It must stop. There is nothing cool about knives. Their carrying all too often leads to their use and to tragedy.”
Boy A was cleared by a jury earlier this month of murder and a later charge of manslaughter after he said he acted in self-defence.
He admitted being in possession of a flick knife and perverting the course of justice after lying to police.
He was sentenced at Manchester Crown Court on Thursday to a 12-month detention and training order for perverting the course of justice and a four-month detention and training order for possessing a blade.
A second 17-year-old defendant, Boy B, was cleared of lying to the police about what he had seen but admitted being in possession of a flick knife. He was sentenced to a four month detention and training order.
Both boys were cleared of conspiracy to commit robbery in the lead-up to Yousef’s death. Their names remained secret during the case as they were under the age of 18.
They will be released halfway through their sentences under supervision.