Yes, but it's not a good idea. First of all, DWI law is a highly complicated field.  There are multiple certifications that lawyers are able to get, which allow us to challenge different elements of DWI cases against you.  For one example, I am certified to operate the Alcotest 7110 machine which is the breath testing machine at the police station.  This means that I can examine the "discovery" in your DWI case pertaining to the breath test results, and challenge the outcome based on the officers use of the machine.  If the machine wasn't used properly, I can have the results thrown out.