MONTREAL- Yvan Grandmaison, the driver accused of killing Ngnan Wong Yee in an accident on a residential street in Dollard-des-Ormeaux on Tuesday night, will remain in police custody until next week.

Facing a charge of impaired driving, something he was previously convicted of in 2004, the crown was seeking heavy conditions for Grandmaison's bail at a court appearance on Thursday.

"We're not finished contacting everybody and making sure that we can offer proper guarantees because of the seriousness of the accusations," said defence attorney Robert Bellefeuille, who hopes to seek bail for his client on Tuesday.

Grandmaison could face additional charges if Yee's husband, 72-year-old Poom Huy Shuy, were to succumb to his wounds.

"He's still in the ICU, battling brain bleeds and swelling," said prosecutor Dennis Galiatsos. "At this point, let's just be positive and keep positive thoughts."

Yee, 73, and Shuy were walking on Ceres Street in DDO on Tuesday when they were struck only metres from their home. Yee was killed instantly. Grandmaison was arrested at the scene, while his blood alcohol level was below the legal limit police were able to arrest him for impaired driving.

A charge of drunken driving means driving with a blood alcohol level above 0.08, impaired driving doesn't imply alcohol, but means the driver wasn't well enough to drive—sleeping at the wheel or under the influence of drugs.

Police now have new tools at their disposal to detect intoxication due to drugs.

"The police officer will measure the blood pressure, the pulse, he will take the body temperature, and he will also examine the body reaction or reaction to different lighting," said police officer Nathalie Valois.

Police can even detect if the person is under the influence of marijuana, cocaine or ecstasy. Grandmaison underwent urine tests after his arrest, the prosecution will reveal on Tuesday what drugs were found in Grandmaison's body.