Sabastian Prosa remembers he drove to a friend’s place, where he had four shots before heading to a downtown bar — where he had an unknown number of drinks served in test tubes.

What the 21-year-old doesn’t remember is what type of alcohol he drank, how he got to the bar, how he left the bar and how he ended up driving his SUV the wrong way down Highway 427 until he crashed head-on into a minivan in the early hours of Aug. 5, 2012.

Jayantha Wijeratne, 49, and daughter Eleesha, 16, were killed, Wijeratne’s wife, Antonette, survived with serious injuries.

Prosa is on trial for 12 offences including impaired driving causing death and criminal negligence causing death. He has pleaded not guilty to all the charges.

“I would suggest this is a day that would stand out in your mind,” Crown prosecutor Tom Goddard said Wednesday while cross-examining Prosa, who took the stand in his own defence.

It is “surprising and unusual” that Prosa would remember the exact number of drinks he had at his friend’s home, but nothing else such as the type of alcohol, how far apart the drinks were or how they came to be drinking, Goddard said.

“All I know is I don’t remember what I drank that night,” said Prosa, who appeared nervous during his testimony and kept his answers brief.

The last he remembers before waking up in the hospital with a broken femur, broken ribs and a lung contusion is standing in Sky Bar, he testified. “I have reason to believe something was put in my drink,” he said.

This belief was the impetus for the defence requesting Prosa’s blood sample taken after the collision be tested at an independent lab for substances such as the date-rape drug GHB, according to a factum the defence filed in support of an application seeking to stay proceedings.

The province-run lab, the Centre for Forensic Sciences, failed to properly package the last remaining blood sample for transport to a U.S. lab and the sample could not be tested, the defence argues.

Given the lost evidence, Prosa cannot make “full answer and defence,” a breach of his Charter rights, the defence argues.

The Crown and defence agree that Prosa’s blood samples tested by CFS and St. Michael’s Hospital contained about twice the legal limit of alcohol.

Prosa testified Wednesday that he had got his G2 driver’s licence after turning 19, less than two months before the collision. At the time he was living in Bolton with his parents and attending York University pursuing a science degree. He hopes to become a doctor.

He could not recall what his work shift that Saturday was, but said that he drove to the Veld music festival at Downsview Park and then to a friend’s place. He planned to stay the night with a friend since he was planning to drink, he testified. He had an overnight bag with him, he said.

Much of the day was taken up with legal arguments about whether statements Prosa made during an examination for discovery in a related civil case could be used by the Crown in cross-examination.

Under questioning in the civil case, Prosa said he “drank a little bit” with his friends before going to the club. He said he had two shots.

During the criminal case, he testified that he had four shots and told the Crown he would not consider that to be “a little bit.”

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Prosa also said in the civil case only three people, including himself, were at his friend’s house the evening before the crash. In the criminal trial he testified that there were five people including himself at the house.

The judge will rule on Thursday about whether the Crown can use Prosa’s statements from the civil proceeding.