US drug trade rising in dark corners of the Web

New York

AS the country's opioid crisis worsens, US authorities are confronting a resurgent, unruly player in the illicit trade of the deadly drugs, one that threatens to be even more formidable than the cartels.

The Internet.

In a growing number of arrests and overdoses, law enforcement officials say, the drugs are being bought online. Internet sales have allowed powerful synthetic opioids such as fentanyl - the fastest-growing cause of overdoses nationwide - to reach living rooms in nearly every region of the country, as they arrive in small packages in the mail.

The authorities have been frustrated in their efforts to crack down on the trade because these sites generally exist on…