Police arrested 99 people in several entertainment outlets in Cheras last night for a variety of drug offences.

Cheras acting police chief Kamal Khan Mohd Shariff said officers inspected 134 customers in karaoke joints and nightclubs in the sting operation led by the Narcotics Criminal Investigation Division.

Kamal said in a statement today that the detainees – 63 men and 36 women aged between 18 and 40 – tested positive for methamphetamine and ketamine.

Thirty of the detainees are foreign, with one each from Thailand and Germany, and 28 from Vietnam. Four of the Vietnamese nationals were picked up for violating their social visit passes.

In one of the nightclubs, the police found 211.6g of ecstasy powder, 32 ecstasy pills, 192g of cannabis, 6.7g of ketamine and 30 Erimin pills stashed in a speaker. Police have yet to ascertain the identity of the owners of these drugs, however.

According to Kamal, officers have raided the same premises four times over the past four years. The nightclub was closed down this year, but reopened last month under new management.

"The raids were tipped off by the public. Police will continue to monitor entertainment premises in the city to keep them from becoming drug dens," his statement read.