Seven pupils are being disciplined after an investigation into cannabis use at an east Devon school.
All the students at Torquay Boys' Grammar School are from Year Nine, aged either 13 or 14.
Some could now face exclusion as a result of the investigation which is being monitored by Torbay Council.
Headteacher Roy Pike has been holding talks with governors, parents and the police and said they were taking the matter "very seriously".
A Torbay Council spokesperson said: "The council will always treat the matter of exclusions extremely seriously and we offer appropriate guidance to headteachers, governors and parents in dealing with these sensitive matters which affect individual pupils and the wider school community.
"The council works in close partnership with all schools to manage pupils' behaviour in order to avoid exclusions wherever possible."