A cake containing cannabis that was served at a school function in Nova Scotia put one adult in hospital and made several children sick last week.
The cake contained edible marijuana with THC - the psychoactive component of cannabis, Royal Canadian Mounted Police said.
Just under ten people fell ill after eating the cake provided by a caterer at the Eskasoni Immersion School's 'mid-winter feast'.
"We don't know how it happened and obviously we're looking into whether it was intentional," Cpl. Jennifer Clarke said.
Mother Kate Augustine said her eight-year-old daughter who tested positive for THC came home from school sweating and pale.
"I was really angry and I'm hurt that that happened to her. I'm just happy she didn't have a really bad anxiety attack or a heart attack," she said.
"I asked her what was wrong and she just kept telling me she was tired and her eyes were sore."
Ms Augustine said the school did not contact her directly about the incident.
A Facebook post by the Eskasoni School Board said "edible marijuana may have inadvertently been placed in a dessert cake served".
The number of Canadian children needing medical care after accidentally consuming cannabis is rising, according to the Canadian Paediatric Society.