The presentation to law enforcement officers had an eye-opening title: “Remorse to Redemption: Lessons Learned.”

Part of the talk was to be given by Kim Potter, a white former Minneapolis-area police officer who was convicted of manslaughter in the high-profile killing of Daunte Wright, an unarmed Black driver, during a traffic stop in 2021. Ms. Potter served 16 months in prison and testified that she had mistaken her handgun for a Taser when she fatally shot Mr. Wright, who was 20.

But Ms. Potter’s message — on the ramifications of using force and ways to avoid it — will not be received by officers working for the Washington State Liquor and Cannabis oversight agency. In an abrupt turnaround, the agency’s leadership canceled Ms. Potter’s training last week amid media inquiries about her presentation, which was set to take place at a symposium in Vancouver on Sept. 23. The Seattle Times, which first reported on the matter, had raised questions about Ms. Potter’s involvement.

The decision to bring in Ms. Potter was made by “well-meaning” officers in the agency’s leadership “who were looking to learn from someone’s mistakes,” David Postman, the body’s board chair, said.

“But this decision was made without the conversation that needs to happen around issues like this,” said Mr. Postman, who last week took part in a move to rescind Ms. Potter’s invitation to speak before the agency, which includes about 100 officers.

The debate over her address underscored two starkly different perspectives on the treatment of police officers after wrongdoing. One view is to allow remorseful police officers to use their experiences to teach others. The other is that they are the wrong messengers and should be excluded from public discussion because of the suffering they can evoke.