I do not have a specific post at my fingertips, but this video has some of the info you want in the first fifteen minutes or so:
https://www.bitchute.com/video/AF7KP5y70CU6/
Try these, don’t know if they are the one you’re looking for.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6080222/
https://www.statista.com/chart/21872/map-of-police-violence-against-black-americans/
All the people who falsely claim that they were abducted by space aliens are making it very difficult for those who actually were to tell their stories and be believed.