An ICE Agent can & do enter courts of law, which is true. But the issue in play, is the practice acceptable in a "Sanctuary City" where Undocumented Aliens are allowed free movement throughout the city, unencumbered by intimidation from Law Enforcement,
The title of this episode, "Long Day's Journey into ICE", is a play on the name of a Eugene O'Neill play, "Long Day's Journey into Night".
The production code was T13.22102.