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What must the state prove to secure a DUI conviction?

On Behalf of | May 6, 2026 | Criminal Defense |

Motorists in Pennsylvania may face driving under the influence (DUI) charges due to traffic stops or collisions. Those accused of DUI offenses often want to avoid convictions whenever possible to retain their driving licenses, ensure they can pass background checks and avoid the numerous criminal penalties that the courts could impose.

A successful defense requires an understanding of what the state must establish to secure a conviction. What evidence is necessary for a prosecutor to secure a DUI conviction when a defendant asserts their innocence?

Proof of control over a vehicle

To face a DUI charge, an individual must be in actual physical control of a vehicle. Typically, that means they must be present in the vehicle with the keys or electronic device necessary to start the vehicle. Police officers do not necessarily need to catch someone on the road in motion or even with the engine running to justify a DUI arrest.

Proof of impairment or elevated alcohol levels

Some people face DUI charges because police officers follow them while they swerve all over the road or people call to report concerns about their conduct in traffic. Others face charges because they cause crashes.

If there is evidence of diminished driving capability, that can be grounds for prosecution. The state can also bring DUI charges when people have blood alcohol concentrations (BACs) above the legal limit, even if there is no evidence of actual impaired capabilities.

Those facing DUI charges may need help reviewing the state’s evidence and exploring different possible defense strategies. Understanding what the state must prove to secure a conviction can help people evaluate different options for fighting Pennsylvania DUI charges.