Kaden Young's mother is alleged to have tested positive for four substances the night her 3-year-old son drowned in the Grand River, court documents show.

According to a letter from Dufferin Child and Family Services, the OPP's toxicology screens alleged Michelle Hanson tested positive for Percocet, OxyContin, cocaine and alcohol on that February night in 2018.

The Banner has obtained additional details about the allegations found within child custody court documents involving Hanson and Kaden's father, Cam Young.

None of the allegations have been proved in court.

An affidavit submitted by Young explains Hanson came into the bedroom where he was, sometime between midnight and 12:30 a.m. on Feb. 21, 2018, and told him she was going to the store to buy cigarettes.

Since Kaden was still awake, Young's affidavit says Hanson proposed to take him with her as car rides often helped the boy to fall asleep.

The court custody documents reveal information found in the "Crown's Brief Synopsis" of the allegations facing Hanson. That synopsis — a summary of the allegations facing Hanson, not evidence that has been proven in court — alleges that:

• Hanson drove past signs and barriers designating the road to be closed.

• A toxicology report prepared by the Centre of Forensic Sciences indicates she had drugs and alcohol in her system.

Ontario court judge Erika Chozik, who presided over the custody case, noted portions of the Crown brief referring to those toxicology results were redacted and not before her as evidence.

She did refer to a Dec. 13, 2018 letter from Dufferin Child and Family Services, which was involved with the family in December 2017 and April 2018.

"The letter confirms that after criminal charges were laid, the DCAFS received information from the OPP that toxicology screens showed that at the time of the accident on Feb. 21, 2018 the mother tested positive for the following substances: Percocet, OxyContin, cocaine and alcohol," Chozik wrote.

"A toxicology report prepared by the Centre of Forensic Sciences apparently indicates the mother had drugs and alcohol in her system. The toxicology report is not before me in evidence," she added. "The only evidence before me of the toxicology results is the reference to it in the Dec. 13, 2018 letter from DCAFS."

During a flood event in the early hours on Feb. 21, 2018, police allege Kaden's mother — who was rescued by emergency responders near Dufferin County Road 109 — drove past a road closure sign marked by orange pylons.

Her minivan was swept into the fast-moving river and deep water. Police say that she managed to free herself and Kaden from the vehicle, but the water wrenched the boy from her arms.

Nearly 60 days after Kaden was lost to the Grand River, the body of the small boy was discovered by a fisherman beneath a bridge along County Road 26 near Belwood Lake on April 21.

About eight months after his disappearance, Hanson was charged by Dufferin OPP with impaired driving causing death, dangerous driving causing death and criminal negligence causing death.

A judicial pretrial has been scheduled for April 9.

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