The city attorney argued that the service, available for up to $100,000 a month, could allow wealthy traders to manipulate the market, while leaving out everyday investors.

© Amir Hamja for The New York Times

City officials — and one determined mother — are working to stop the spread of cychlorphine, which is far more potent than fentanyl.

Mayor Daniel Lurie wants to combat evictions in the city, which has the nation’s highest rent increases.

© Mike Kai Chen for The New York Times