Behind CBS4's Driving While Stoned Investigation

• Colorado drivers urged to check vehicle, tires ahead of first snowstorm

  

• Suspected drunk driver hits homes, cars in Northfield; 2 officers hurt

  

• At least 3 killed when SUV crashes into North Hollywood food stand; driver arrested on suspicion of murder

  

• Man shot while driving on Chicago's Far North Side

  

• DeKalb County police officer arrested in drug investigation

  

• Driver's mistake caused Salem High football bus crash, investigators say

  

• Denver, Littleton file lawsuit against Bow Mar over plan to gate intersections

  

• Georgia's next insurance commissioner explains her priorities