Randomized Trial Shows Smartphone Support App for DWI Offenders and Their Families Reduced Alcohol Use and Ignition...

Driving while intoxicated (DWI) remains a preventable source of morbidity and mortality in the United States. Ignition interlock devices (IIDs) are used to prevent DWI offenders from driving while intoxicated during a mandated installation period and are effective during that time. Once IIDs are removed, DWI rates are similar to levels for offenders who had no IID. This study tested the efficacy of a smartphone app (B-SMART) for DWI offenders with an IID and concerned family members (CFMs), with the goal of reducing IID lockout events and alcohol consumption.

Four B-SMART app modules were developed: (a) Life with Interlock, (b) Supporting Changes in Drinking, (c) Doing Things Together, and (d) Effective Communication. Participants (pairs of DWI offenders and CFMs) were randomly assigned to receive the B-SMART app (n = 58) or referral to a state IID information page (usual and customary [UC] condition, n = 65) and followed for 9 months after randomization. IID data (failed tests and lockout events) were obtained from IID providers as the primary outcome variables. Offender and CFM reports of alcohol consumption in the last 30 days before assessment were secondary measures.

IID data were collected on 62% (N = 76) of participants. B-SMART participants had significantly fewer lockout events than UC participants. B-SMART offenders and their CFMs reported significantly less likelihood of DWI offender drinking at 9 months.

Results suggest that the B-SMART app reduced IID lockout events and DWI offender alcohol consumption. These outcomes are important because fewer IID lockout events predict lower DWI recidivism.