There's a massive outbreak of police violence against civilians, especially black civilians. That's what you've heard, right? Colin Kaepernick says it. The Washington Post says it. Must be true, since you hear it all the time.
What you rarely hear with these stirring tales is any rebuttal from the police. The people making the claims are sure they were mistreated, and they're sure that whatever procedure was used on them was brutish and horrible and impossible to justify in any way. Of course, most of these people have no training in police procedure and really have no idea why a certain thing was done.
Also, sometimes when people tell this hair-raising stories, they're just lying. They have an ideological agenda, or they want attention for themselves, or they just hate the police. Whatever the reason, they lie. And the liars usually figure the police will not come forward with evidence to refute their lies. But sometimes they're surprised, as was the case with liberal columnist Bill Clark of the Columbia Daily Tribune after he wrote this piece of garbage.