An officer’s brief holding and questioning is not an arrest, but is a detention.  A common example of a detention is an officer pulling over a driver for a traffic violation. The driver is not free to leave, but is also not under arrest. An arrest involves the police taking someone into custody through a more significant restraint on movement, often involving the use of handcuffs and telling you that you are under arrest. Since you are only required to submit to a Breathalyzer or blood test after being under arrest, it is important to understand at what point you are under arrest. That way you know when you can still refuse a Breathalyzer or blood test and when refusing will lead to a driver’s license suspension or added penalties if you are convicted of a DUI.