A tweet with over 13 million views on X ignited the debate: account @pubity described the coming US mandate as "constant surveillance." But the actual law is more nuanced. Section 24220 of the 2021 Infrastructure Investment and Jobs Act requires all new passenger vehicles sold in the US to incorporate "advanced drunk and impaired driving prevention technology" by September 2027. The mandate calls for passive monitoring of driver performance—not full video surveillance as some critics claim.
NHTSA Still in Review Phase
The National Highway Traffic Safety Administration (NHTSA) is responsible for implementation. It missed the original November 2024 deadline for a final rule; as of early 2026, the project remains under review. New cars may start fitting the tech by late 2026, but the hard deadline is September 2027. The buffer window for automakers is shorter than anticipated.
Two Technology Routes, Neither Passes 99.9%
Two competing approaches are vying for the mandatory order: breath-based (sensors embedded in the steering column to passively capture alcohol concentration) and touch-based (infrared sensors on the start button or steering wheel to measure blood alcohol concentration via skin optics). NHTSA demands system accuracy of 99.9% before deployment. Even at that level, millions of false positives per year could lock out sober drivers or force engine shutdown. No mass-produced solution has cleared this bar.
Privacy Black Hole: Law Permits Selling Your Breath Data
Beyond the tech debate lies a less-discussed legal gap. Section 24220 explicitly does not require automakers to share biometric data—but also does not prohibit it. The US has no federal law governing the ownership or use of biometric data collected inside vehicles. This means automakers can legally hold, sell, or license driver breath patterns, skin optical signatures, and calculated BAC records—provided they disclose it in privacy policies. The data holds immense commercial value for insurers, advertisers, and law enforcement.
Automaker Pushback: More Than Cost
Automakers oppose the mandate not just because of technical difficulty. Once installed, they bear product liability risk for false-positive engine shutdowns. Lawsuits from sober drivers locked out of their cars could cause brand damage far exceeding development costs. If future federal law closes the biometric data loophole, the hardware could also trigger compliance headaches. Some automakers are lobbying for a delayed deadline or reduced liability standards tied to the accuracy threshold.
Three variables will decide the outcome: whether NHTSA finalizes the rule by September 2027, whether the industry can mass-produce a 99.9% accurate solution in time, and whether Congress will legislate to fill the biometric data protection gap. The tech itself is no longer the primary risk—the speed of the legal framework is.