Did a little research on the DUI/DWI testing situation. Like a lot of laws they can vary by state, county, city. In my county it is an automatic DUI if you refuse the test. They do have the right to ask you to step out of the car. If you pass a breath test on the spot they can still take you down to the station if they still feel you are impaired and/or the test was incorrect. (chewing gum when pulled over, etc). I do live in a dry county (except for our very large casino resort) so that may have something to do with the laws here.

Before you get pulled over would be a good time to look up state and local laws as far as Rx'd meds, refusal rights, and what constitutes probable cause in your area. While ignorance of a law will never hold up in court, don't count on your local LE to ALWAYS be a good source of information. Most LE are well meaning, but may not always be aware of gray areas themselves. We all need to prepare ourselves in advance for this situation, many people believe that ANY meds obtained over the internet are illegal, even if we are not driving.