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D.C. public-school students can learn a lesson about the peculiar nature of home rule by checking out the license plates of the school system’s own police unit: All 14 Chevrolets in the fleet sport Virginia or Maryland tags. “It’s nothing against the District,” explains Janis Bolt, associate director for supplier relations and communications in the D.C. Office of Contracting and Procurement. Bolt explains that two District companies bid on the three-year, $21 million contract in 1996, but the lowest bid came from MVM Inc. of McLean. MVM officials say they lease cars from Enterprise Rent-A-Car, which registers all its local vehicles outside the District. But MVM officials hasten to add that approximately 60 percent of the squad’s 315 security officers are D.C. residents.