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The text messages are "a great idea," says Heidi Castle, a national spokeswoman for Mothers Against Drunk Driving.
The primary purpose of a sobriety checkpoint "is to deter people from driving drunk," Castle says. "You want to stop them before they get on the road." A critical part of that process, she says, is letting the public know that checkpoints are planned.

“It may deter some from making a deadly decision,” adds Troy Green, a national spokesman for AAA. If a reminder that police will be stopping motorists causes someone to drink fewer beers or arrange for a designated driver, Green says,“it has the potential to save your life and other lives as well.”