The law behind whether and when you should roll down your window is a bit complicated. At Fair DUI we recommend not rolling down your window initially, and holding up the Fair DUI flyer pressed against the window so the officer can read it.
This surprises a lot of people and is counter to advice we’ve seen from groups like the ACLU. They often recommend rolling down your window at least a crack. At bottom you can see the great video, Busted: A Citizen’s Guide to Police Encounters. We agree with much of what you see in the video, but we believe you should only roll down your window when the officer orders you to do so.