The convict was charged under the Drug trafficking, corruption and other criminal offences and could face a jail term up to 10 years, a fine up to S$500,000 or both.
A woman was seen at Ang Mo Kio coffee shop, with some blood spots on her hands and cloth while she was crying next to an unconscious man, who was taken to a hospital.
Four injured adults were taken to Singapore General Hospital and three children were taken to KK Women's and Children's Hospital after the accident that involved four cars including an Audi and Toyota.
The sentencing for the accused police officer will happen on June 20 and he can face a jail term with canning for being a member of two secret societies in Singapore.