The drug which put six students from Hamilton's Fairfield College in hospital was the class C drug BZP along with other controlled substances, not the class B drug ecstasy as had been suspected.



Announcing the results of the analysis of the pills, police also said they had charged a 38-year-old woman with possession of a class C controlled drug.



The woman's daughter, who was alleged to have taken the drugs to school, had been referred to Youth Aid, Hamilton city area commander Inspector Rob Lindsay said.



More referrals to Youth Aid were likely as the investigation continued.



The small, round, pink pills with a bird stamped on them, taken by up to 11 students at the school early last week were analysed by ESR.



Six girls aged 13 to 15 were admitted to Waikato Hospital after taking the pills, and were described by a nurse who treated them as "highly excitable" and acting "crazy".



Today, Lindsay said police had been working with a number of agencies in relation to the matter including the school, the Ministry of Education and Child Youth and Family.



The outcome of any Youth Aid referrals was not all about punishment, rather it was to ensure appropriate support services were available to the young people concerned and that the support is ongoing.



To achieve that police would be working with the teenagers and their families.