Driving under the influence (DUI) is a serious criminal offense in the Philippines. Governed primarily by Republic Act No. 10586, otherwise known as the "Anti-Drunk and Drugged Driving Act of 2013," the law penalizes persons driving motor vehicles while under the influence of alcohol, dangerous drugs, and other similar substances.
For victims, law enforcers, and the general public, understanding how a drunk driving case is initiated, investigated, and prosecuted is crucial for ensuring accountability and justice.
1. The Legal Threshold: When is a Driver "Under the Influence"?
Under R.A. 10586, a driver is considered to be driving under the influence of alcohol if their Blood Alcohol Concentration (BAC) level exceeds the legally permissible limit at the time of screening.
- For Private Motor Vehicles: A BAC level of 0.05% or higher is the threshold for prosecution.
- For Public Utility Vehicles (PUVs), Trucks, Buses, and Motorcycles: The limit is strictly 0.00%. Any trace of alcohol in the blood of these drivers is a violation of the law.
2. The Apprehension and Testing Protocol
A drunk driving case cannot be filed based on mere suspicion or the smell of alcohol alone. Law enforcement officers must follow a strict, standardized statutory protocol to ensure the evidence stands up in a court of law.
Step 1: Probable Cause and Flagging Down
A Deputized Law Enforcement Officer (DLEO) must have probable cause to believe that a driver is driving under the influence. Visible signs include:
- Erratic driving (weaving, swerving, sudden stops)
- Involvement in a traffic accident
- Physical manifestations upon routine stopping (slurred speech, bloodshot eyes, reeking smell of alcohol)
Step 2: Field Sobriety Tests
If there is probable cause, the officer will conduct three sequential field sobriety tests:
- The Eye Test (Horizontal Gaze Nystagmus): Following an object with the eyes to check for involuntary jerking.
- The Walk-and-Turn Test: Walking nine steps forward in a straight line, heel-to-toe, turning, and walking back.
- The One-Leg Stand Test: Standing on one foot while counting aloud for about 30 seconds.
Step 3: Breathalyzer Testing (BAC)
- If the driver passes all three tests, they are apprehended only for the traffic violation that prompted the stop.
- If the driver fails any of the tests, the officer will use a certified Breath Analyzer (Breathalyzer) to determine the exact BAC level.
Important Note on Refusal: If a driver refuses to undergo field sobriety or breathalyzer tests, the DLEO is authorized to confiscate their driver's license and immediately impound the vehicle. This refusal is documented and creates a strong presumption of guilt in the subsequent legal proceedings.
3. The Criminal Filing Process
Once a driver fails the breathalyzer test (or explicitly refuses it), the process transitions from a traffic stop into a criminal procedure.
Phase 1: Arrest and Detention
The driver is placed under warrantless arrest pursuant to Rule 113, Section 5 of the Revised Rules of Criminal Procedure (arrest in flagrante delicto). The driver is brought to the nearest police station, and the vehicle is impounded.
Phase 2: Inquest Proceedings
Because the arrest was made without a warrant, the police must immediately prepare the case for Inquest Proceedings before the city or provincial prosecutor’s office within the strict reglementary periods (usually 12 to 36 hours depending on the severity of the offense/injury).
- The Complaint-Affidavit: The arresting officers or the private offended party (if an accident occurred) will file a complaint.
- Evidence Attached: Police blotter, Traffic Accident Report (TAR), Field Sobriety Test results, Breathalyzer printed print-out, and medical certificates (if injuries occurred).
- The Prosecutor's Role: The prosecutor determines if there is probable cause to hold the driver for trial. If found, an Information (the formal criminal charge) is filed in court. The driver may post bail for temporary liberty if detained.
4. Penalties and Liabilities Upon Conviction
The penalties under R.A. 10586 vary significantly depending on whether the offense resulted in property damage, physical injuries, or homicide.
| Scenario / Result of the Offense | Imprisonment Term | Fine (PhP) |
|---|---|---|
| No Injury or Property Damage | 3 months | ₱50,000 to ₱100,000 |
| With Property Damage | 3 months or applicable RPC penalty | ₱100,000 to ₱300,000 |
| With Physical Injuries | Penalties under Art. 263 of the Revised Penal Code (RPC) | ₱150,000 to ₱250,000 |
| With Homicide (Death) | Penalties under Art. 249 of the RPC (Reclusion Temporal) | ₱300,000 to ₱500,000 |
Administrative Penalties (Driver's License)
In addition to criminal penalties, the Land Transportation Office (LTO) imposes separate administrative sanctions:
For Non-Professional Drivers: * First Offense: 12-month suspension of driver's license.
Second Offense: Perpetual revocation of driver's license.
For Professional Drivers: * First Offense: Perpetual revocation of driver's license. This completely bars them from ever operating a public utility or commercial vehicle again.
5. Overlap with the Revised Penal Code (RPC)
It is critical to note that filing a case under R.A. 10586 does not preclude the filing of separate or complexed charges under the Revised Penal Code.
If a drunk driver hits a pedestrian and causes death, the prosecutor can file a case for Reckless Imprudence Resulting in Homicide (Article 365 of the RPC) in relation to R.A. 10586. Under Philippine jurisprudence, driving under the influence qualifies as a qualifying aggravating circumstance, which elevates the penalty to its maximum period, significantly increasing the prison time for the accused.