You finished enjoying a wonderful meal with a special someone in your favorite local restaurant. During dinner, the waiter asked if you and your date would like to try the house wine. You thanked him for the suggestion and ordered the wine. You only drank one glass because you knew you'd shortly be behind the wheel of a motor vehicle.
Getting arrested isn't a pleasurable experience for anyone, but whether you think the arrest is justified or not there are rules and protocols that police, prosecutors, and the court need to follow to ensure that any evidence they gather during the arrest process is admissible and maximize the strength of their case against you.