Kedah AADK director Razif Wan said a total of 47 individuals underwent urine tests in the operation, which ran from Saturday until yesterday evening.

“Of that number, 37 individuals tested positive for drugs, and most of them were youths,” he told reporters here today.

The first SPM candidate was detained together with his 21-year-old sister upon their return from Danok, Thailand, after attending the Songkran festival there.

“Test results found that the sister was positive for three types of drugs, namely methamphetamine, MDMA and ketamine, while her younger brother, who is sitting for SPM this year, tested positive for ketamine,” Razif said.

He said the siblings admitted to taking the substances out of curiosity, and were now facing action.

He said they were believed to have been exposed to the prohibited substances after allegedly smoking cigarettes suspected of containing drugs while attending the Songkran festival.

The other SPM candidate was detained after testing positive for ketamine, along with a 22-year-old friend, at an AADK roadblock at the same complex.

They were detained under Section 3(1) of the Drug Dependants (Treatment and Rehabilitation) Act 1983.