U.S. prosecutors accused a Mexican governor and nine other current and former Mexican officials of participating in a broad conspiracy to help a powerful Mexican cartel import drugs into the United States in exchange for bribes and votes.

The Trump administration is no longer allowing federal funds to be used for purchasing or distributing test strips that can determine if street drugs have been mixed or cut with fentanyl or other contaminants, a reversal that comes amid the administration’s broader opposition to harm reduction practices. In an open letter to federal grantees, the Substance Abuse and Mental Health Services Administration said it was ending...

To stay ahead of the next wave of synthetic drugs, the U.S. must also learn from countries that are often the first to encounter them.