Dozens of cities and states rolled out emergency curfews in response to unrest sparked by the killing of George Floyd, but the experience has led some legal and criminal justice experts to question their usefulness and legality.

Several cities, including Cincinnati and Los Angeles, have been sued over claims that their curfews were unconstitutional. Law-enforcement officials say curfews make it easier for police to target criminals, while protesters say they have been arrested in droves while engaged in nonviolent activities.

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