On April 19, 25-year-old Baltimore resident Freddie Gray became the latest casualty of police violence in the United States.
Exactly one week earlier, he was apprehended for fleeing unprovoked from cops in a "high-crime area". A stint in the back of a police van left him with afatal spinal injury, although the precise details of the affair have thus far been shrouded in secrecy.
According to the Gray family lawyer, the young man was detained for "running while black, and that's not a crime".
But as I recently noted in a blog post for The London Review of Books, a handy US Supreme Court ruling has made it possible to conduct arrests without probable cause in "high-crime areas".