Photo: Suffolk County DA Office, Lyft

In a month where ride-sharing companies almost considered leaving a state entirely over background check policies, this latest incident is likely to reignite questions about the companies’ own efforts: A Boston Lyft driver who’s accused of stabbing a passenger on Christmas Day had a prior conviction that, according to Lyft’s background check standards, should’ve made her ineligible to drive for the company.

Kiona Thomas, 25, was previously convicted for possession of a class B substance and resisting arrest in 2010. And, as the Boston Herald noted, the offense should’ve made her ineligible to drive for Lyft.

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According to Lyft’s standards for background checks, “Every driver is screened for criminal offenses and driving incidents.” The standards say a driver will be ineligible if the background check reveals convictions within the past seven years that include: a violent crime, a felony, or a drug-related offense.

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Lyft didn’t immediately respond to a request for comment. In a statement to the Boston Globe, the company didn’t respond to questions from the newspaper about her record, but said Thomas — who was arraigned on Tuesday for one charge of assault with intent to commit murder and is held on $15,000 bail — has been “permanently deactivated” from its system and had violated Lyft’s no-weapons policy.

“We remain ready and willing to assist law enforcement as they investigate this tragic incident,” the statement said.

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The emergence of Thomas’ background comes as the state of Maryland agreed last week to exempt both Lyft and Uber from requiring drivers to undergo an extensive fingerprint-based background check, saying the companies’ checks were “as comprehensive and accurate as the fingerprint-based background check.” The move, at the very least, prevented both ride-sharing services from fleeing the state, as they did earlier this year in the city of Austin.

Elsewhere, in Michigan, an Uber driver was charged this month for allegedly stabbing a passenger several times during a snowstorm, after the victim tapped on his window. That driver, Jacob Allemon, has no reported criminal record.

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In August, Massachusetts Governor Charlie Baker signed new legislation that requires Uber and Lyft drivers in the state to undergo a state background check, as well. Those checks won’t be completed until April 3.

Thomas is due back in court January 27.