A Bruneian man and a Malaysian woman were detained by Royal Malaysia Police personnel after methamphetamine drugs worth RM12,000 were found in a house in Miri occupied by the two.
The man aged 41 and the woman aged 35 are being probed for drug trafficking offences, according to a report in The Borneo Post.
The Bruneian had five previous drug-related offences.
Miri Police Chief Assistant Commissioner Lim Meng Seah confirmed the arrests.
He said the police had classified the case as drug trafficking under Section 39B of the Dangerous Drugs Act which carries the mandatory death sentence upon conviction.
He said the duo were arrested on Friday during a raid.