A Minnesota state board wrongly denied a teaching license to Jeronimo Yanez, the former police officer who shot and killed Philando Castile in 2016, a state court ruled Tuesday.

Yanez, who was acquitted of manslaughter charges in the Castile case, applied for a substitute teaching job in 2020, but was denied. The state board listed the reason for his rejection as "immoral character or conduct," but a Minnesota Court of Appeals now says that reason is too vague.

"The board’s decision must focus exclusively on Yanez’s conduct and his fitness to be a teacher, not fitness to be a police officer," the ruling states, adding that any rejection must establish that Yanez "violated moral standards for the teaching profession."

The shooting of Castile, a black man, inside his car sent waves of protest across the country. Yanez argued that Castile had a firearm and that he feared for his own safety, but Castile was later shown to have a permit for the gun.

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Minnesota police officer Jeronimo Yanez was acquitted of manslaughter in the shooting death of motorist Philando Castile. (Star Tribune via WHD)

A memorial including a photo of Philando Castile adorns the gate to the governor's residence in St. Paul, Minn. (Copyright 2016 The . All rights reserved. This material may not be published, broadcast, rewritten or redistribu)

Castile's girlfriend was in the car with him along with her then 4-year-old daughter at the time of the  shooting she and streamed the aftermath of Castile's shooting live on Facebook. Yanez shot Castile, a 32-year-old elementary school cafeteria worker, several times during the incident.

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Following his acquittal, Yanez took a buyout from his former police department and left the force in 2017.

"Since Officer Yanez was not convicted of a crime, as a public employee, he would have appeal and grievance rights if terminated," the city said in a statement at the time. "A reasonable voluntary separation agreement brings to a close one part of this horrible tragedy. The City concluded this was the most thoughtful way to move forward and help the community-wide healing process proceed."

Diamond Reynolds recounts the incidents that led to the fatal shooting of her boyfriend Philando Castile by Minneapolis area police during a traffic stop on Wednesday, at a "Black Lives Matter" demonstration in front of the Governor's Mansion in St. Paul, Minnesota, U.S., July 7, 2016.  (REUTERS/Eric Miller)

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The protests following Castile's death proved to be only a preview of what Minnesota and the country would endure following the police killing of George Floyd in 2020. Floyd's murder would end in a conviction, however, for the Minnesota police officer in that case, Derek Chauvin.

The contributed to this report.