Senior staff sergeant Iskandar Rahmat, who is accused of the double murder in Kovan has been found not to be of unsound mind and fit to plead.
The prosecution disclosed this in court on Friday when the 34-year-old's case came up for mention via video-link from Changi Prison.
A pre-trial conference will be held in the High Court on Sept 24.
Iskandar will next appear via video-link again on Oct 1.
He has been charged with murdering car workshop owner Tan Boon Sin, 66, and his 42-year-old son, Chee Heong, at a terrace house in Hillside Drive on July 10.
The body of the younger victim, a businessman, was found on the road outside Kovan MRT station after being dragged for a kilometre under a car.
Iskandar, who has been with the police force for 14 years, was arrested in Johor Baru after a 54-hour manhunt.