ELMIRA, N.Y. (WENY) -- Wednesday marked the start of the fourth day of the Caden Charnetski's bench trial. Several people took the stand, including two experts who spoke about the effects of marijuana. 

The first to take the stand was New York State Trooper, Brandon Salyerds. He talked about the sobriety test at the hospital the night of the accident, where he noticed Charnetski's eyes fluttered and had tremors. Salyerds also noted Charnetski's eyes were watery and bloodshot. 

The next person to take the stand was Elizabeth Spratt, a forensic toxicologist. She says marijuana changes a person's reaction time, and when driving, they won't have the ability to pay attention to everything. By having active THC in Charnetski's system around the time of the accident, Spratt believes he had to have been impaired.

The defense then called up pathologist, Scott LaPoint, who refuted Spratt's earlier claims. He says 25% of people involved in car crashes are under 25-years-old because they're inexperienced. LaPoint went on to say there's too many variables, like how much THC made its way into Charnetski's system, and how potent the marijuana was, to figure out if he was under the influence at the time of the crash.

Charnetski is on trial for manslaughter and other charges after a motor vehicle accident last July in Horseheads claimed the lives of Harolyn and Matthew Matteson on their motorcycle. The bench trial is set to resume on Thursday with accident reconstruction. Stick with WENY News both on-air and online as this case develops.