Why are PK's so difficult to find on IOP's and DNM's?

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think main reason why pk's are hard to find is different laws and culture,now not to offend anyone but here in Europe you need to break quite few bones and get hospitalized to get morphium drip,otherwise one in many cases gets aspirin or neurofen without the active ingridient or small dosage of it,that its hard to get hooked on.Thus from what ive seen US are main consumer,while this opens market but since its not used outside hospitals much etc its quite hard to get,thus people turning to cough syrups that contain dhc.