Justice Sotomayor's dissent is worth reading. This is a sad, sad case, and she highlights that wonderfully with this statement:

The Department of Justice, Sotomayor writes, “recently reported that in the town of Ferguson, Missouri, with a population of 21,000, 16,000 people had outstanding warrants against them.” That means 76 percent of Ferguson residents have, under the court’s decision, effectively surrendered their Fourth Amendment right against unreasonable seizure.