First, write down everything you remember about the stop - time, location, what the officer said, what tests you were asked to perform, and whether you were read Miranda warnings. Second, hire a Massachusetts DUI lawyer immediately so the 15-day RMV hearing request can be filed. Third, do not talk to the police or insurance adjusters about the arrest. Fourth, do not post about it on social media - prosecutors and ADAs do check Facebook and Instagram. Fifth, photograph any injuries, bruises, or marks from the arrest. Sixth, pull your own Google Maps timeline and request any dashcam or bodycam footage preservation through counsel. The first 48 hours set up everything that happens in court - evidence disappears fast, and cruiser videos are often overwritten on a 30 or 60-day loop.