The stunning new details offer a rare look at how technology can be exploited in the high-stakes battle between US law enforcement and the violent Mexican cartels that control illicit drug trade.

Justice Department report reveals 2018 security breach allowed Sinaloa cartel to track FBI movements and target potential witnesses during El Chapo investigation

The hacker was able to break into the agent’s phone remotely and watch their incoming and outgoing calls, and even monitor the phone’s geolocation.