Missing paperwork led judges in New Hanover County to repeatedly drop DWI cases.
But court officials say the technically didn't persuade judges in most other parts of North Carolina to do the same.
Defense lawyers have repeatedly challenged DWIs because of missing paperwork that should have been filed with the defendant. The requirement took effect last year under new laws.
The North Carolina Court System says that New Hanover County appears to be one of a few counties where cases were dismissed.
The county's Chief District Court Judge Jay Corpening says judges in Brunswick and Guilford counties may have been the only others to discarded cases.
Court officials say most district court judges haven't accepted the argument that the missing paperwork adversely affected the cases of defendants.