Probable cause is the legal reason an officer needs to detain and investigate.
If the dui attorney can show to the judge the officer did not have probable cause, the drunk driving case can be dismissed. Most detentions begin with the officer pulling over a driver who has committed a vehicle code infraction. The common reasons alleged by the police are based on poor driving - speeding, weaving within or outside the lane, running of a stop sign or red light. A driver involved in an accident or in a car blocking the roadway may also give the officer the right to detain and investigate. If arrested, one's manner of driving is an important issue to review with your drunk driving defense attorney.