"You're Not Going to Investigate a Federal Officer
It doesnt happen often, but local law enforcement can arrest and charge federal agents. Legal experts say theres a moral obligation to at least try to hold federal immigration officers accountable when they violate the Constitution and the law.
Minutes after a federal agent shot and killed a Mexican immigrant in a Chicago suburb last September, a group of police officers stood on the sidewalk trying to figure out the answer to a question of protocol: Who would investigate the shooting?
Wouldnt it be states, at a minimum? one Franklin Park officer asked, according to body camera footage.
Chief Mike Witz shook his head. No, because its a federal shooting, he said. Youre not going to investigate a federal officer.
His officers didnt investigate. In their report, they didnt even note the names of the two Immigration and Customs Enforcement agents at the scene of Silverio Villegas Gonzálezs death. Instead, they deferred to the FBI.
https://www.propublica.org/article/why-local-state-police-rarely-investigate-ice-cbp-fbi