Hire counsel. I know you may feel this is the mantra on Avvo, but that is not the case here. You need an attorney to investigate and catch them at it. It may involve the disclosure of other defendants' records, etc. It is complicated.
The information provided herein does not create an attorney-client relationship. The information provided is to suggerst some general principles and should not be relied upon for client decisions. Only upon the hiring of counsel can such advice be custom-tailored to the client's specific situation and needs.
Attorney Taub is correct. Hire an experienced dwi attorney to represent you and to conduct a thorough investigation of the evidence (or lack thereof) and a full analysis of all defenses which may be asserted. the advice given here is general in nature and your case indicates that an attorney will need to roll up his/her sleeves and look at everything from soup to nuts including engage in extensive discovery.