Illustration of an ignition interlock. The vehicle shown is not connected to the case.
U.S. DUI NEWS · COURT EXPLAINER Collierville, Tennessee · November 10, 2026 A driver can leave a car in the driveway all weekend. An ignition interlock checks nothing while it sits there. A wearable alcohol monitor can still take readings. That difference helps explain a detail from Tuesday’s hearing in Collierville, Tennessee, after the Highway 385 crash that killed Rebecca Case , a mother of nine. [ Action News 5: November 10 hearing · NHTSA: ignition interlocks · SCRAM Systems: how the bracelet works ] On November 10, an attorney for Derek Kyle Johnson , 37, told Action News 5 that his client must have an ignition interlock installed in any vehicle he drives before he can be released. He must also wear a SCRAM alcohol monitor. His bond remained at $250,000. [ Action News 5: November 10 hearing ] What happens when the driver turns the key? First comes a breath sample. If the reading exceeds the device’s preset limit, the interlock keeps the engine from starting. It answers a n...