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The tetrahydrocannabinol (THC) content of hash oil varies tremendously, since the manufacturers use a varying assortment of marijuana plants and preparation techniques. Dealers sometimes cut hash oils with other oils.  
Hashish is a potent grade of cannabis. It’s made from resin extracted from the flower clusters and top sugar leaves of the marijuana plant. Hashish oil extracts are the most potent.
That’s why you will hear people saying they are ‘blasting a bunch of BHO tonight.’ The marijuana inside the container is stripped of it’s cannabinoids by the butane. The butane/marijuana liquid mixture that escaped is then evaporated, getting rid of as much foreign substances (mainly butane) as possible and keeping as much of the good stuff as possible. The end result can look like honey, or wax, etc.
R v Oakes  1 S.C.R. 103 is a case decided by the Supreme Court of Canada which established the famous Oakes test , an analysis of the limitations clause (Section 1) of the Canadian Charter of Rights and Freedoms that allows reasonable limitations on rights and freedoms through legislation if it can be demonstrably justified in a free and democratic society .