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Officers will also do breath checks in the mornings
West Midlands and West Mercia's Police forces are launching their summer drink drive campaign today ahead of this weekend's Jubilee celebrations.
They're warning drivers not to drink before getting behind the wheel or risk being arrested.
They'll be doing random breath checks throughout this month, and they won't just be at night - officers will also be breathalysing motorists in the morning, as some people may still be over the limit the following day.