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A type of "working dog"; is trained to blow into the "ignition [interlock]" system that people charged with [drunk driving] have to install into their vehicles for it to operate. This system requires the operator to blow into the machine [periodically] through the course of a drive. A Blowing Mouth Dog (BMD) can fulfill this duty with some simple training. Most BMDs are from the local pound as they need to be willing to circumvent the law.
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