"The office rejected this case because of lack of corroboration and on the ground that there is no reasonable likelihood of conviction on the domestic violence matter," a spokesperson for the Los Angeles City Attorney's Office told TMZ Sports. "Bottom line, lack of sufficient evidence."
Per TMZ's report: "Penn was named a suspect in an April 29 incident when cops were called to his L.A. home to respond to a call about an altercation with his wife. Cops were told Penn got handsy and, at one point, he allegedly poured a drink on her head. Later, both Penn and his wife denied the altercation ever turned physical."
While the authorities have dropped the case, Penn could still face discipline from the NFL. Dallas Cowboys running back Ezekiel Elliott, for instance, was suspended six games by the NFL this past season after an investigation into domestic violence allegations even though he wasn't arrested or charged with a crime.
Penn, 35, has spent the past four seasons with the Raiders.