www.standard.co.uk/news/uk/department-for-education-metropolitan-police-services-scotland-yard-hackney-b988292.html
Please read the formal review.
Essentially the teaching staff called the police because a black 15 year old girl smelt of cannabis. She was taken to a room and strip searched. She was on her period. Her mother wasn't notified. She was not given the opportunity for an appropriate adult to be present.