HB 1315
In CommitteeHouse
Impaired driving
Concerning impaired driving.
This status may be delayed. See Action History below for the latest updates.
How does a bill become law?
- Introduced: The bill is filed and assigned a number.
- Committee: A subject-matter committee holds hearings, takes public testimony, and decides whether to advance the bill.
- Floor Vote: The full chamber (House or Senate) debates and votes on the bill.
- Opposite Chamber: The bill repeats the committee and floor vote process in the other chamber.
- Governor: The Governor reviews the bill and decides whether to sign or veto it.
- Signed: The bill has been signed into law.
AI Analysis
This bill lowers the legal blood alcohol concentration (BAC) limit for drivers age 21+ from 0.08 to 0.05, and eliminates the legal limit for drivers under age 21 (BAC must be 0.00). It also tightens rules around THC limits, expands affirmative defenses for post-driving consumption, and increases penalties for repeat offenders—including jail time, electronic monitoring, sobriety programs, and longer license suspensions. The bill also requires public education and an independent evaluation of its impacts.
- Lowered legal alcohol concentration limits: from 0.08 to 0.05 for drivers age 21+ (breath or blood); from 0.02 to 0.00 for drivers under age 21.
- Lowered legal THC concentration limit: 5.00 nanograms per milliliter of blood for all drivers (unchanged), but above 0.00 is illegal for drivers under age 21.
- New or clarified affirmative defenses for people who consumed alcohol or cannabis *after* driving and before testing—must be proven by a preponderance of evidence and disclosed to prosecutors in advance.
- Stricter penalties for repeat offenders: escalating jail time, electronic monitoring, 24/7 sobriety program requirements, and longer license suspensions/revocations based on number of prior offenses within 7 or 15 years.
- Mandatory ignition interlock devices for all convictions of impaired driving (including reckless driving and negligent driving in the first degree if related to alcohol/drugs), with additional installation periods for having minor passengers in the vehicle.
Who is affected
- Drivers under age 21 — Drivers under age 21 face stricter limits on alcohol and cannabis use before driving; violations are misdemeanors and may require substance use disorder assessments.
- People charged with impaired driving — People charged with impaired driving may use an affirmative defense if they consumed alcohol or cannabis *after* driving and before testing, but must notify prosecutors in advance.
- People convicted of impaired driving — People convicted of impaired driving face escalating penalties based on prior offenses, including jail time, electronic monitoring, sobriety programs, ignition interlock devices, and license suspensions or revocations.
- Liquor-licensed businesses and hospitality industry — Hospitality businesses (e.g., bars, restaurants) are explicitly protected from civil liability changes under this bill; the law reaffirms existing standards for serving intoxicated patrons.
- State and local government agencies — State agencies including the Washington Traffic Safety Commission, Department of Licensing, and Washington State Institute for Public Policy have new responsibilities for public education, enforcement, and evaluation.
Pro/Con Analysis
Potential Benefits (5)
Stricter penalties for repeat offenders—including longer license suspensions, mandatory ignition interlocks, and enhanced monitoring—deter recidivism and reduce repeat impaired driving incidents, directly improving road safety for all Washingtonians, especially vulnerable road users like pedestrians and cyclists.
Public SafetyPeopleRef: Sec. 4(6), Sec. 4(9)(a)-(c), Sec. 4(11), Sec. 4(12)Mandated public education campaigns and independent evaluation will increase awareness of lowered BAC/THC limits and measure real-world impacts—helping correct implementation gaps and ensure policies are evidence-based rather than politically driven.
Public SafetyPeopleRef: Sec. 11, Sec. 13Mandatory ignition interlock devices for all convictions—including reckless and negligent driving if alcohol/drug-related—reduce recidivism by preventing intoxicated driving at the vehicle level, a proven public health intervention supported by CDC and NHTSA data.
Public SafetyPeopleRef: Sec. 4(5)(a), Sec. 4(5)(c), Sec. 4(6), Sec. 4(9)(a)-(c)The affirmative defense for post-driving consumption, while procedurally demanding, provides a narrow but important safeguard for individuals who consumed alcohol or cannabis *after* driving—e.g., at a bar after parking safely—preventing unjust convictions for non-impaired driving.
Rights & LibertiesPeopleRef: Sec. 1(3)(a)-(b), Sec. 3(3)(a)-(b), Sec. 2(2)Enhanced penalties for repeat offenders—including jail time, electronic monitoring, and sobriety programs—create stronger deterrents and support structured rehabilitation, reducing long-term recidivism and associated public costs of repeated arrests and court processing.
Public SafetyPeopleRef: Sec. 10, Sec. 4(1)-(3), Sec. 4(5)(a)-(d), Sec. 4(6), Sec. 4(9)(a)-(c), Sec. 4(11), Sec. 4(12), Sec. 4(13)
Potential Concerns (5)
Lowering the BAC limit to 0.05% criminalizes drivers who are not impaired—many people metabolize alcohol differently, and 0.05% can be reached after one standard drink for some individuals. This expands the pool of people subjected to arrest, booking, and criminal penalties for behavior that may not impair driving ability, increasing strain on courts and jails without clear safety gains.
Public SafetyPeopleRef: Sec. 1(1)(a), Sec. 3(1)(a), Sec. 5(1)The affirmative defense for post-driving consumption requires defendants to notify prosecutors in advance and prove by a preponderance of evidence—shifting the burden of proof and creating a procedural trap for low-income or unrepresented defendants who may not understand legal strategy, increasing risk of wrongful conviction.
Rights & LibertiesPeopleRef: Sec. 1(3)(a)-(b), Sec. 3(3)(a)-(b), Sec. 2(2)Mandatory ignition interlock devices, electronic monitoring, and 24/7 sobriety programs impose significant out-of-pocket costs on individuals—often $70–$150/month for interlocks and $100+/month for monitoring—with no income-based waivers, disproportionately burdening low- and middle-income drivers and potentially trapping them in cycles of debt or license loss.
FinancialPeopleRef: Sec. 10, Sec. 4(1)-(3), Sec. 4(5)(a)-(d), Sec. 4(6), Sec. 4(9)(a)-(c), Sec. 4(11), Sec. 4(12), Sec. 4(13)The bill imposes unfunded mandates on counties and municipalities for electronic monitoring, 24/7 sobriety programs, and enforcement, while requiring state agencies to fund public education and evaluation—diverting limited local resources from other public safety priorities without offsetting state funding.
Local GovernmentPeopleRef: Fiscal Impact Summary, Sec. 11, Sec. 13The 0.00% BAC limit for drivers under 21 criminalizes teens who may have consumed trace amounts of alcohol (e.g., in food, mouthwash, or fermented beverages) or who are falsely accused—without distinguishing between meaningful impairment and minimal exposure—risking school disciplinary actions, college admissions setbacks, and long-term criminal records for minor infractions.
Rights & LibertiesPeopleRef: Sec. 2(1), Sec. 2(5), Sec. 4(1)(a)-(b), Sec. 3(1)(a)-(b)
Who Is Most Affected
Low- and middle-income drivers—especially those without reliable transportation—face significant financial and mobility burdens from mandatory interlock devices, monitoring costs, and license suspensions; may be disproportionately impacted in rural or transit-poor areas.
Youth under 21 face heightened criminalization risk for minimal or accidental alcohol exposure; may face school disciplinary actions, college admissions setbacks, and long-term barriers to employment or housing due to misdemeanor records.
Counties and municipalities must fund electronic monitoring, sobriety programs, and enforcement without state reimbursement—diverting funds from other public safety priorities like fire, EMS, or community policing.
Hospitality businesses are explicitly shielded from civil liability changes, but may face increased liability exposure if patrons drink on-site and drive—though the bill reaffirms existing standards, reducing new risk.
State agencies (WTSC, DOL, WSIPP) gain new responsibilities for education, enforcement, and evaluation—increasing administrative burden but potentially improving data-driven policy and long-term public safety outcomes.