Protests have not subsided in Sacramento, a week after city and state law enforcement concluded that the officers who shot and killed Stephon Clark did not commit a crime.

Last week, hundreds of high school and college students from around Sacramento marched to the California state capitol building to protest the decision. On Monday, Sacramento police arrested 84 activists and journalists, declaring the protest unlawful after alleged vandalism (the Sacramento district attorney declined to press charges). And yesterday, a vigil for Clark turned into a protest that ended at the District Attorney’s Office.

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Research by the Stanford Law School’s Criminal Justice Center suggests that interviews fully independent from the employing agency, which in this case would be the Sacramento Police Department, are a best practice when looking into police shootings.