In some ways, DWI drug cases are easier to defend, but in some ways, they are harder. In all ways, it is complicated. Attorneys need to have experience defending DWI drug cases, so they are able to give a client the best chance of having a fair trial, and not falsely convicted of these offenses. There is a requirement the attorney must have experience, and familiarity with these drugs, and with different metabolites resulting from that particular drug. The attorney needs to have experience in cross-examining drug recognition experts, officers, and forensic toxicologists who testify about blood test, substances, or drugs used in the blood test.
It is a very specialized area of DWI trial work. The person, who has been accused of a DWI, or drugs, needs experts in that area, and not just an expert who knows about alcohol.