What can a police officer request from a driver, even if they are not under arrest?

In the context of traffic stops, a police officer can request a voluntary blood draw from a driver, even if that driver is not under arrest. This request is typically made when there is reasonable suspicion that the driver is impaired. A blood draw provides a more accurate measure of blood alcohol concentration (BAC) compared to other methods, and it can be conducted voluntarily when the driver agrees to it.

While some options may seem plausible, the nature of their application is different. For example, a field sobriety test and breath analysis are standard procedures that can be administered when there is reason to believe the driver is impaired, but these are often conducted in situations where the officer may be preparing to make an arrest. A quick medical evaluation, on the other hand, does not fall under the routine tools of law enforcement for assessing impairment, as it generally pertains to emergency medical situations rather than evaluating a driver's capacity to operate a vehicle.

Thus, the option of a voluntary blood draw aligns with the protocols concerning consent and the collection of evidence in suspected DUI cases, which reinforces why this option stands out among the others.