The District Attorney will need to prove his case, using the information supplied by the police. The proof of DUI is contained in five factual categories.

Oxnard and Ventura police periodically set up DUI checkpoints. In the checkpoint police officers talk to drivers looking for signs of driving under the influence of alcohol or drugs. In a mid- January checkpoint Oxnard police arrested five individuals on suspicion of DUI and these individuals will now face accusations of driving under the influence of alcohol or drugs.