Durham Region police have seized 42 kilograms of the deadly opioid carfentanil, saying it’s believed to be the largest seizure of the drug in the country. Carfentanil is a synthetic opioid similar to fentanyl but 100 times more potent, and an amount weighing less than a grain of salt can kill someone.

Police seized 42 kilograms of the deadly opioid carfentanil from a home in Pickering, saying it’s believed to be the largest seizure of the drug in the country.

Police said they seized 53 kg of unknown substances from a Pickering, Ont., home on Sept. 20 and Health Canada has confirmed 42 kg of that was carfentanil. Maisum Ansari, 33, of Oshawa, is charged with possession of carfentanil for the purpose of trafficking. Police also seized 33 guns and other prohibited devices in their search of the home.

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The man was charged last month with 337 weapons-related charges, including careless storage of a firearm, unauthorized possession of a firearm and possession of a restricted or prohibited firearm. With files from Alina Bykova