You do not have to be driving drunk to be arrested for DWI or DUI.  Drivers are frequently accused of driving under the influence, when in fact, they were never drunk.  Even if you have only had a couple of drinks, you can be arrested for drunk driving if you are pulled over by a police officer.

A police officer has to have a justifiable reason to pull you over for suspected drunk driving.    However, it is not difficult for them to find an excuse, but they usually only focus on the vehicles with obvious violations.  For example, if you are speeding, run a red light or roll through a stop sign, chances are that you will be pulled over by a police officer.  You should also be aware that if you have had a prior DUI or DWI conviction and are driving around late at night, police officers will be looking for a reason to pull you over.  Police officers are known to spend a lot of time reading license plate numbers by inputting them into a central database.  A prior DWI or DUI conviction will show up for the registered driver of the vehicle.

The time of day that you are on the road can also make the difference as to whether or not you will be stopped for DUI or DWI.   Police officers will be looking for drunk drivers during regular bar hours and during special events, such as festivals and sporting events.  Try to avoid areas that are highly concentrated with bars and nightclubs, which will reduce your odds of being pulled over for drunk driving.

The article, What to Expect During a DUI or DWI Stop, has more information about this topic.