A visit to a port of entry at America’s Mexican border reveals the difficulties in stopping the flood of fentanyl—a cheap, potent and ever more deadly drug. Javier Milei, Argentina’s president, is looking to blunt measures to escape an economic morass; our correspondent says he should instead look to Peru’s past (10:43). And remembering Robert Badinter, who killed off France’s guillotine (17:17).

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