A driver tells the officer, "I had only one drink three hours ago," but the officer smells a strong odor of alcohol, sees slurred speech, and observes red watery eyes. Which conclusion best balances observation and the driver's statement?

1. The driver's statement is automatically true.
2. Objective indicators contradict the statement and justify further investigation (e.g., field sobriety tests).
3. The officer must immediately release the driver.
4. The officer must arrest without further investigation.