In December 1989, then-President George H.W. Bush made the controversial decision to invade Panama in an effort to capture dictator Manuel Noriega. The operation, known as Operation Just Cause, had a number of intended goals, but its outcomes were a mix of successes and failures.
One of the main reasons cited for the invasion was Noriega's involvement in drug trafficking, which was seen as a threat to the United States. Noriega's surrender and subsequent imprisonment in the US was seen as a success in that regard, as it removed a major player in the drug trade from power.
However, despite Noriega's capture, drug trafficking did not decrease as expected. In fact, some argue that his imprisonment only led to more drugs being sent to the United States as other criminals stepped in to fill the void left by his absence.