Professor Allyson MacVean, who led the study, said they should be introduced as part of every school's anti-drugs strategy.
Schools have been urged to use sniffer dogs to stop pupils using drugs following a successful pilot scheme in Buckinghamshire secondary schools. A study by Buckinghamshire Chilterns university college found most pupils (82 per cent), parents (98 per cent) and staff (92 per cent) were in favour of dogs, which searched classrooms and were stationed at school gates.
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