What is the difference between cannabis from OCS and cannabis from a dispensary?

In Ontario, OCS is the only online cannabis retailer and wholesaler of legal recreational cannabis. Cannabis products can be purchased at a number of privately-owned authorized retail stores across the province. Cannabis products made available from private dispensaries and other illegal sellers are not regulated by Health Canada and are likely to be untested, meaning that the product may be unsafe for consumption. All cannabis sold at OCS is sourced directly from producers licensed by Health Canada and must be tested and certified by Health Canada–approved labs.