The NSA can know where drugs are and who is using them. That doesn't mean the NSA knows how to stop them. Drug users and dealers and importers have an army and

The NSA can know where drugs are and who is using them. That doesn't mean the NSA knows how to stop them. Drug users and dealers and importers have an army and are willing to fund it with whatever level of resources necessary to keep free commerce flowing. And if the national government took the measures necessary to significantly reduce drug use, their resources would be cut off because voters wouldn't stand for the much heavier and pettier and more expensive police state tactics. So the best bet for the government is burn vast amounts of money to randomly hurt random people without ever seeking any kind of improvement in the situation. More information doesn't affect that calculation.