Police officers who suspect people of drunk driving often take immediate steps to collect evidence. Once they have sufficient proof supporting their suspicions, they may then decide to arrest the driver. The evidence that they have gathered can help the prosecutor bring charges and secure a conviction if the case goes to trial.
The evidence collection process often begins even before a motorist realizes they are under suspicion. What proof can the police gather before and during a traffic stop to show that a motorist is under the influence?
Footage of questionable driving
Showing that a driver demonstrated impaired ability can justify drunk driving charges. Frequently, police officers follow motorists for a while before initiating a traffic stop. They may record dashboard camera footage of the driver swerving or otherwise driving in an unsafe manner. If the driver does something particularly concerning, such as driving off onto the shoulder or crossing the center line, the officer may immediately turn on their lights and pull the driver over with the intent of potentially arresting them.
Field sobriety test results
Once a driver has pulled over for an officer, they typically have to identify themselves. Officers may ask them a few questions about whether they have had anything to drink. After the driver answers, the officer may ask them to submit to field sobriety testing. They have the driver perform a series of physical tasks that can help validate the officer’s suspicion of alcohol intoxication. Video footage of field sobriety test performance can be a key form of evidence in a drunk driving case.
Chemical test results
Once officers have probable cause to believe that drunk driving occurred, they can arrest a driver. After initiating the arrest, they may conduct a chemical test. Roadside breath testing is a fast way to gauge a driver’s intoxication. That being said, false positives are common, as are artificially high readings due to a broad range of different issues.
Drivers arrested for alleged alcohol intoxication on the road may need help evaluating the state’s case and developing a criminal defense strategy. Understanding the types of evidence that police officers collect can help people as they consider their options for mounting a defense against drunk driving allegations.