Melaka police chief Zainol Samah said the suspects, including two senior police officers, aged 31 to 55, were arrested at about 11.30pm.

Zainol said the raiding team seized 5.2 litres of ketum water, packed in several bottles and wrapped in plastic, in addition to two police uniforms and a bowl.

“All the arrested officers are attached to the Melaka police headquarters, and we will ensure that the investigation is carried out transparently.

“There will be no compromise with officers engaged in disciplinary violations that may harm the reputation of the police force,” he said in a statement.

Zainol added that necessary measures would be taken against officers who engage in activities that could undermine credibility and erode the public’s trust in the police force, reported Bernama.

He said a remand application for the six suspects would be made today.

The case will be investigated under Section 30(2) of the Poisons Act 1952. The offence is punishable under Section 30(5) with a fine not exceeding RM10,000, imprisonment for a term of not more than four years, or both, upon conviction.