The official line remains the same: The 10-month campaign of strikes on small boats in the Caribbean and eastern Pacific has nearly stopped the flow of drugs by sea into the United States. In December, President Trump boasted about a 92 percent drop in seaborne shipments. Last month, in an apparent sign of further progress, he said the decline was up to 97.2 percent. But government officials and agencies closest to the action, at sea and on America’s streets, tell a different story. In hearings,