What establishes probable cause to administer a chemical test for DUI?

• A. A hunch by the officer.
• B. Observable signs of impairment (e.g., slurred speech, unsteady balance, odor of alcohol) plus corroborating driving or field sobriety indicators.
• C. A confession from the driver.
• D. A standard field sobriety test result alone.

Answer: (B)

Probable cause to administer a chemical test is based on objective observations that the driver is impaired, supported by indicators related to driving performance. When an officer sees signs such as slurred speech, unsteady balance, or the odor of alcohol, and also notes driving or field sobriety indicators like weaving, erratic steering, or other indicators of impairment, those pieces of evidence together form a reasonable belief that a chemical test is warranted. A mere hunch isn’t sufficient, and a confession, though relevant, doesn’t by itself establish the necessary grounds. Similarly, a field sobriety test result alone may not be enough without additional observable signs or corroborating driving indicators.