Got milk? If so, you've got higher prices, bureaucratic meddling, billions of pounds of surplus dairy products, and complicated mathematical formulas that define how much farmers can charge for the nutritious white beverage. That's because the production and sale of milk has been regulated by the federal and state governments since the 1930s. And 70 years of regulation has created a bigger mess than 10 gallons of spilt milk on a shag carpet. Take Massachusetts, for example. In October 2002, the Bay State's Department of Food and Agriculture launched an investigation of Midland Farms, a small chain of grocery stores....