LINCOLN -- Ignition interlocks are supposed to keep people guilty of a DUI from driving drunk again. Before the car will start, the driver has to blow into the device. If it detects any alcohol at all, the car won't start. Lancaster County Chief Deputy Sheriff, Jeff Bliemeister, says deputies are pulling over more people who are supposed to have an interlock on their vehicle...but don't. One possible reason is the cost. For every month a convicted DUI driver drives with ones of these locks installed, they have to pay a $70 maintenance fee. There's also a removal fee at the end of the process. About 4,000 Nebraskans are supposed to have these devices in their cars.