Hear what viewers had to say about Carol Marin’s conversation with Arne Duncan and the latest developments in the battle over the Lucas Museum when we read feedback from the "Chicago Tonight" website, and our Facebook and Twitter pages.

Crain’s Chicago Business managing editor Ann Dwyer takes a closer look at why the Old Main Post Office may be the target of a city of Chicago eminent domain takeover and other business headlines.

The FBI wants Apple to unlock an iPhone belonging to one of the people behind December's mass shooting in San Bernardino, California. Apple says it's taking a stand for privacy rights, while the FBI says it's merely trying to conduct the most thorough investigation possible.

Watch the February 24, 2016 full episode of Chicago Tonight.

As the U.S. Department of Justice carries out its investigation of the Chicago Police Department, U.S. Attorney Zachary Fardon joins us to discuss updates on the probe, the recent spike in gun violence gripping the city, and some of the high-profile cases his office has handled over the last few months.

Opioid and heroin overdose deaths hit record levels in 2014, according to the Center for Disease Control and Prevention. The alarming rise in heroin deaths has tripled since 2010. "Chicago Tonight" talks about the heroin crisis with the executive director of a treatment facility and the founder of an anti-heroin education and advocacy foundation.

Would you pay a toll to zoom past traffic in an express lane on the Stevenson? That's one of the big ideas the Chicago Metropolitan Agency for Planning has for the Chicago region. Geoffrey Baer has an exclusive look at their newest plan.

"The crux of the issue is that Illinois' funding of public education is broken," the former U.S. Education Secretary said on "Chicago Tonight." Watch the full interview and get highlights from the discussion.

Watch the February 22, 2016 full episode of Chicago Tonight.

Saturday's Republican primary race in South Carolina gave a big boost to political outsider Donald Trump, and left many Republicans stunned when the establishment candidate, Jeb Bush, dropped out of the race. Geoffrey Cowan's new book traces the history of the presidential primary process from its first days in 1912. 

The death of Supreme Court Justice Antonin Scalia has created new battle lines between the president and Senate Republicans. Is a constitutional crisis on the horizon?

The disaster in Flint has spotlighted the dangers and adverse health outcomes of lead seeping into communities’ drinking water. Elizabeth Brackett reports on the lead pipes carrying water into Chicago and suburban homes.