Headmaster Neil Richards did make the point in a short written statement to Phuketwan that random drug testing is a feature of all schools on Phuket and that BIS complies with all laws.
''All schools have a zero tolerance policy,'' he said. ''The drug testing is a legal requirement.''
Confidentiality of headmaster-staff relations prevented Mr Richards from saying more.
It is known that all staff at the school, and other Phuket schools, are tested randomly for drugs.
According to the Phuket rumor, one of the teachers involved in failing the test protested innocence and was cleared in a more substantial second test.
Other staff at BIS are randomly checked, staff members confirmed today.
''We really take pride in this,'' one senior staffer said today. ''I am very proud that we have had this policy for years now. The parents appreciate us treating this seriously.''
The random tests are done by nurses under the control of Phuket's Public Health Department.
British International School, rated as among the best on Phuket, has more than 300 staff and 812 pupils. Students perform well by international standards.
''I don't see it as a big issue,'' the staffer said. ''Students are also tested. It's school policy.
''We comply with the local education requirements. All schools should be doing tests. The real story is if schools are not doing it.''