There are many different circumstances that can lead to an arrest on drug charges, but one of the most common is a traffic stop. People who are transporting illegal drugs, whether in small quantities for personal use or large amounts for distribution, are usually aware that violating traffic laws increases the chances that they will be caught. Running a red light or speeding past a state trooper is a good way to get pulled over, and if the officer who stops you finds probable cause to search your vehicle, you could find yourself in serious legal trouble.