Legal Standards Flashcards

What is the legal BAC limit for commercial motor vehicle drivers under federal law?

Answer: 0.04%

Federal regulations set a 0.04% BAC limit for commercial vehicle drivers, half the standard 0.08% limit.

Under most state zero-tolerance laws, what BAC triggers a DUI charge for a driver under 21?

Answer: Any detectable amount (0.01–0.02%)

Zero-tolerance laws make it illegal for drivers under 21 to operate a vehicle with any measurable BAC, typically defined as 0.01% or 0.02%.

When a DUI suspect invokes the right to counsel before submitting to a chemical test, most states require:

Answer: A reasonable opportunity to contact an attorney before testing

Most states allow suspects a reasonable opportunity — not unlimited time — to consult counsel before a chemical test, balancing rights with evidence preservation.

What is the primary purpose of an officer documenting observable clues during SFSTs in a written report?

Answer: To create a contemporaneous record that supports probable cause and withstands cross-examination

Accurate, contemporaneous documentation of SFST clues establishes probable cause and provides a reliable basis for testimony at trial.

Which legal standard governs whether an officer had sufficient justification to make a DUI arrest?

Answer: Probable cause

An arrest requires probable cause — a reasonable belief, based on articulable facts, that the suspect committed a crime.

A defense attorney challenges SFST evidence by arguing the officer lacked certification. What is the likely legal outcome?

Answer: The court may reduce the weight of the evidence or allow it with proper foundation testimony

Lack of formal certification affects credibility and foundation, but courts typically weigh rather than automatically suppress such evidence.

Under the Sixth Amendment, a DUI defendant's right to confront witnesses means:

Answer: The arresting officer must testify in person about SFST observations rather than submitting only a written report

The Confrontation Clause requires that testimonial evidence be subject to cross-examination, meaning the officer must appear and testify.