Chad's shut down

I’m curious what the RCMP are referring to when they say that two people were taken to hospital after ingesting something sold at Chad’s… Since they haven’t suggested anywhere that they were selling illegal drugs out of the store, I assume that the people had a bad reaction to one of the many ‘legal highs’ that a place like Chad’s sells. If that’s the case, it can hardly be laid at the feet of the owner or anyone working in the store.