...see THIS article:

https://www.cnn.com/2019/07/16/politics/eric-garner-william-barr-nypd-officer-daniel-pantaleo/index.html

'Attorney General William Barr made the decision not to bring federal civil rights charges against the New York Police Department officer accused of fatally choking Eric Garner, siding with a Justice Department team from New York over the Civil Rights Division in Washington due to concerns that prosecutors could not successfully prove the officer acted willfully, a senior Justice Department official said.
The decision to not pursue the charges against the officer, Daniel Pantaleo, came after a dispute between the teams, the official said. Barr made the decision after viewing the video showing Garner's takedown several times and quizzing both groups of attorneys.'

FYI