Phones could detect drinking over legal driving limit

People sit at a pub table with crisps, drinks and phonesImage copyright Getty Images

Smartphones can detect when you’ve had too much to drink by monitoring your walk, a study has found.

American researchers used sensors in smartphones to detect when somebody was over the legal drink-drive limit.

Phones were able to do this with about 90% accuracy when users walked just 10 steps in the study by the University of Pittsburgh.

Scientists hope the discovery can be used to develop device alerts, such as asking people not to drive while drunk.

“We have powerful sensors we carry around with us wherever we go,” lead researcher Brian Suffoletto said. “We need to learn how to use them to best serve public health.”

The study had 22 participants aged 21 to 43, who were given a vodka and lime juice drink every hour until they reached the UK and US drink-drive limit of 80 milligrams of alcohol per 100 millilitres of blood.

With a smartphone strapped to their back, the participants performed a walking task every two hours – walking a straight line for 10 steps, turning around, and walking back.

About 90% of the time, the researchers were able to identify those over the limit through changes in gait highlighted by the phones.

Image copyright Press Association
Image caption It’s hoped alerts could be developed on phones to stop people from driving while over the limit

One application could be to notify users who may not think they are impaired that they should not drive.

“I lost a close friend to a drinking and driving crash in college,” Dr Suffoletto said. “And as an emergency physician, I have taken care of scores of adults with injuries related to acute alcohol intoxication.

“Because of this, I have dedicated the past 10 years to testing digital interventions to prevent deaths and injury related to excessive alcohol consumption.”

Although this is a small preliminary study, the scientists hope it lays a foundation for further research. They want to carry out additional experiments which better mimic how people carry their phones, like in their hands or pockets.

Last year, almost 360,000 admissions to English hospitals were primarily due to drinking alcohol, with about 6,000 alcohol-specific deaths.

“In five years, I would like to imagine a world in which if people go out with friends and drink at risky levels, they get an alert at the first sign of impairment and are sent strategies to help them stop drinking and protect them from high-risk events like driving, interpersonal violence and unprotected sexual encounters,” Dr Suffoletto said.

The findings were published in the Journal of Studies on Alcohol and Drugs.

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