The Inefficiency of Buureaucracy

I had asked a question in class concerning law and economics. My question was about how it is economically efficient to have a large bureaucracy like ours that is clearly i as well as expensive. Wouldn't it be better to reduce the number of people involved in favor of a smaller, more efficient group of people? We have state governments, which are almost as large as the federal government in some respects, but they are still under the rule of the federal government. This means that if they do something that isn't in line with the federal laws (marijuana laws for instance) then there is a use of resources on both the state and federal level that are acting against one another. The state residents who, through state tax money, employing individuals to regulate certain parts of the marijuana industry while sending more tax money to the federal government to pay for the DEA, who in turn, are spending money to raid the places where marijuana is being sold legally under state law. Our Government is a federalist system, yet an inefficient one on many accounts. The states are only submissive to the federal government on certain levels, but the federal government is still able to cross that line by holding federal funds over the state governments head. It would seem that this system of government is costing us a lot more than it really should. A lot of tax money is going to fund opposing governmental groups and agencies, which is just a big waste of money. It just doesn't make sense to allow the wasting of money on a large inefficient bureaucracy.