Imagine that you're stopped by the police. You're not really sure of the reason, but they ask you to get out of your vehicle. You comply, but you're quickly tested to see if you're intoxicated.
There are a number of reasons why a person might choose to drink and drive. Perhaps they don't think that they've had too much to drive. Maybe there was an emergency. Whatever the situation is or was, the reality is that drinking and driving can result in an arrest and penalties.