Researchers estimate that 17,100 deaths from police violence went unreported during a nearly 40-year period. RELATED: Elijah McClain: Aurora police, medics indicted in death of Black man https://youtu.be/w9297IGAtxM More than half of police killings in the U.S. are not reported in official government data, and Black Americans are most likely to experience fatal police violence, according to a new study released Thursday. An estimated 55% of deaths from police violence from 1980 to 2018 were misclassified or unreported in official vital statistics reports, according to the peer-reviewed study by a group of more than 90 collaborators in The Lancet, one of the world's oldest and most renowned medical journals. Previous studies have found similar rates of underreporting, but the new paper is one of the longest study periods to date. » Subscribe to USA TODAY: http://bit.ly/1xa3XAh » Watch more on this and other topics from USA TODAY: https://bit.ly/3oAEPFy » USA TODAY delivers current local and national news, sports, entertainment, finance, technology, and more through award-winning journalism, photos, videos and VR. #BlackLivesMatter #policeviolence #racialinjustice