For a driver age 21 or older operating an ordinary private car in Iowa, what alcohol-concentration level is itself a statutory basis for an OWI offense, separate from the rule against operating while under the influence?
Correct answer: 0.08 or more.
Iowa’s OWI statute includes operating with an alcohol concentration of 0.08 or more as one basis for the offense. This asks for the legal standard, not whether a particular unadjusted test reading proves it. A concentration below 0.08 does not make driving while under the influence lawful.
Source: Iowa Code 2026, chapter 321J, section 321J.2(1)(a)–(b), reader lines 108–114; alcohol-concentration definition section 321J.1(1), physical page 1, lines 64–67; test-margin qualification section 321J.2(14) and displayed history through 2024 Acts chapter 1182 section 50, physical page 5, lines 291–303. Primary physical PDF page 2; corresponding printed page matches. Code footer dated December 9, 2025; actual official body read and question reviewed October 1, 2026. Targeted 2026 amendment-index check identified section 321J.1(7), reconciled to enacted chapter 1118 section 6; no full-law or judicial-interpretation audit claimed. ↗
An Iowa driver is under the influence of alcohol but argues that driving is lawful because the alcohol concentration is below 0.08. Is that argument correct?
Correct answer: No. Operating while under the influence of alcohol is an OWI basis separate from the 0.08 concentration rule.
The law separately prohibits operating while under the influence of an alcoholic beverage. The 0.08 concentration provision is not the only basis for OWI, so being below that number does not excuse alcohol-impaired operation. This scenario concerns alcohol, not the statute’s separately qualified prescription-drug provisions.
Source: Iowa Code 2026, chapter 321J, section 321J.2(1)(a)–(b), reader lines 110–114; prescription-drug exceptions section 321J.2(11), physical pages 4–5, lines 248–260, read as a scope boundary; section history physical page 5, lines 296–303. Primary physical PDF page 2; corresponding printed page matches. Code footer dated December 9, 2025; actual official body read and question reviewed October 1, 2026. Targeted 2026 amendment-index check identified section 321J.1(7), reconciled to enacted chapter 1118 section 6; no full-law or judicial-interpretation audit claimed. ↗
A 19-year-old driving a private car in Iowa says that only the adult 0.08 rule matters. Which statement correctly describes the separate under-21 rule?
Correct answer: Operating at 0.02 or more violates the under-21 rule and carries a licensing consequence; that is distinct from automatically establishing a criminal OWI conviction.
Section 321J.2A prohibits a person under 21 from operating with an alcohol concentration of 0.02 or more and provides for DOT license or operating-privilege revocation under the applicable process. It separately preserves prosecution under applicable criminal provisions; the lower threshold is not an automatic finding of guilt under every criminal OWI rule.
Source: Iowa Code 2026, chapter 321J, section 321J.2A(1)–(2), complete section beginning physical page 5 and continuing page 6, reader lines 308–325, history through 2018 Acts chapter 1041 section 127; certification and test-margin context section 321J.12(5)–(6), physical page 18, lines 984–996. Primary physical PDF page 6; corresponding printed page matches. Code footer dated December 9, 2025; actual official body read and question reviewed October 1, 2026. Targeted 2026 amendment-index check identified section 321J.1(7), reconciled to enacted chapter 1118 section 6; no full-law or judicial-interpretation audit claimed. ↗
In Iowa, an officer properly uses an approved device for a preliminary breath-screening test. What is the role of that screening result?
Correct answer: It helps the officer decide whether to arrest or request an authorized chemical test; it is not interchangeable with that later test.
The preliminary result may inform the arrest decision or a request for an authorized chemical test. The statute limits its use in court to proving that a chemical test was properly requested. This does not mean that refusing preliminary screening has no consequences or that it is the same request as a formal chemical test.
Source: Iowa Code 2026, chapter 321J, section 321J.5(1)–(2), complete section beginning physical page 12 and continuing page 13, reader lines 699–711, history through 1995 Acts chapter 48 section 12; section 321J.6(1)(c), preliminary-refusal condition, page 13, lines 726–727. Primary physical PDF page 13; corresponding printed page matches. Code footer dated December 9, 2025; actual official body read and question reviewed October 1, 2026. Targeted 2026 amendment-index check identified section 321J.1(7), reconciled to enacted chapter 1118 section 6; no full-law or judicial-interpretation audit claimed. ↗
A conscious adult without a CDL or CLP is lawfully arrested for Iowa OWI after driving a private car. The officer has the required grounds, makes a timely written request for a formal breath test, and gives the required advice. What can follow if the driver refuses that test?
Correct answer: DOT license revocation through the required officer-certification and notice process, without requiring an OWI conviction first.
A refusal of properly requested formal breath testing falls under the refusal provisions. DOT acts on the required officer certification and statutory notice process; the consequence is not dependent on first obtaining an OWI conviction and is not described here as an instant revocation. This question is not about preliminary screening, blood-test exceptions, warrants or an unconscious person.
Source: Iowa Code 2026, chapter 321J, sections 321J.8(1)(a) and 321J.9(1), reader lines 767–772 and 795–804; lawful-arrest grounds, timely request and breath-refusal treatment in section 321J.6(1)(a), (2), physical page 13, lines 713–746; notice/effective-date process section 321J.9(4), physical pages 14–15, lines 812–827, history through 2024 Acts chapter 1050 sections 4, 10, 11. Sections 321J.6(3), .7, .8(2), .10 and .10A were read as limiting contexts; their specialized procedures are excluded. Primary physical PDF page 14; corresponding printed page matches. Code footer dated December 9, 2025; actual official body read and question reviewed October 1, 2026. Targeted 2026 amendment-index check identified section 321J.1(7), reconciled to enacted chapter 1118 section 6; no full-law or judicial-interpretation audit claimed. ↗
