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Colorado State Troopers perform a road side sobriety test. Photo: Andy Cross / Getty

With states continuing to legalize or decriminalize marijuana, scientists and entrepreneurs are rushing to invent a marijuana breathalyzer that would detect whether someone was impaired while driving, according to STAT, instead of relying on more subjective sobriety tests.

The key problem: While urine and blood tests can show whether someone has used marijuana, they can't test impairment. While some states have set a legal limit of THC for drivers, some experts say that frequent smokers could pass the THC level without actually being impaired, according to STAT.

One new idea: Massachusetts General Hospital researchers are working on a cap, which would use a technique called functional near infrared spectroscopy (fNIRS) to detect changes in blood flow in the brain. The researchers hope to establish patterns in the brain when subjects are high.

Driving high: Many people feel more aware and more capable of driving when stoned than they do when drunk. Dr. Mike Lynn, the CEO and co-founder of Hound Labs, which is working on a marijuana breathalyzer, told STAT that when his lab had people who were high on marijuana drive through an obstacle course, “all of them hit that cyclist when they were stoned, and most of the time, they didn’t even know they’d hit him.”

Go deeper with STAT's full piece.

Go deeper

Updated 3 mins ago - Politics & Policy

White House touts "progress" after Manchin, Schumer meet with Biden

Senate Majority Leader Chuck Schumer (left) and Sen. Joe Manchin at the U.S. Capitol in 2014. Photo: Win McNamee/Getty Images

Sen. Joe Manchin (D-W.Va.) and Senate Majority Leader Charles Schumer (D-N.Y.) huddled with President Biden on Sunday morning in Delaware for a "productive discussion" about a deal on Biden's soft infrastructure reconciliation bill, per a White House readout of the meeting.

The latest: "They continued to make progress, will have their staffs work on follow-ups from the meeting, and agreed to stay in close touch with each other and the wide range of members who have worked hard on these negotiations," per the White House.

9 mins ago - Axios on HBO

Rand Paul claims vindication in battle with Anthony Fauci

Sen. Rand Paul (R-Ky.) told Mike Allen in an interview for "Axios on HBO" that President Biden should fire Anthony Fauci "just for lack of judgment, if nothing else."

The big picture: Paul claims vindication in his dispute with Fauci, played out at heated Senate hearings, over the level of risk of U.S.-funded research in Wuhan, where COVID began.

"Atmospheric river" swings Northern California from drought to flood

Satellite view of the bomb cyclone swirling off the coast of the Pacific Northwest and the atmospheric river affecting California on Oct. 24. (CIRA/RAMMB)

A series of powerful "atmospheric river" storms are delivering historic amounts of rainfall across parts of drought-stricken California and the Pacific Northwest this weekend, forecasters warn.

Why it matters: The strong atmospheric river, packing large amounts of moisture, is causing Northern California to whiplash from drought to flood.