Courts, expert witnesses, prosecutors and defense attorneys in states across America are raising questions about the tests police use to test the alcohol levels of suspected drunk drivers. Thanks to years of challenges from defense attorneys and judges willing to hear...

After a few drinks with your friends, you hop in your car. A few miles down the road, you catch a glimpse of red and blue in your rearview mirror. Your breath catches as you pull over. Many people have experienced this moment. They thought they were okay to drive, but...