As some lawmakers press U.S. universities to curtail ties with China, a postdoctoral student’s prosecution raises questions about how big the danger actually is.

Everything the Trump administration is doing to stop the flow of drugs is just making the problem worse.

Zhi Dong Zhang, who escaped house arrest in Mexico this summer, is accused of supplying cartels with fentanyl from China, smuggling and money laundering millions under the alias “Brother Wang.”