Being arrested is never a fun moment for anyone. Not only are you arrested, but you are almost guaranteed to take a massive financial hit. The reason you need an attorney is that it gives you a better chance of reducing the penalties that go along with the arrest. You are looking at an assortment of different monetary losses in the process of going through a DWI charge. Having legal advice on your side might hit the pocket book. In the end, though, it will help you get the best deal.