CNN goes on the trail of a suspected serial killer with a man who went undercover to nab him. Don't miss "CNN Presents: To Catch a Serial Killer" at 8 pm ET Sunday night, replaying at 11 pm ET and 2 am ET.

Doctors studying to become dermatologists have, for years, shared exam questions by memorizing and writing them down after the test to become board certified, CNN has confirmed.

Reports of the use of what are known as "airplane notes" comes after revelations last month that radiology residents around the country for years also have used what are known as "recalls" to prepare for the written exam, which is one step in becoming certified by the American Board of Radiology.

In the wake of the CNN story, the group that oversees 24 medical specialties issued a statement condemning the use of the recalls.

The American Board of Medical Specialties said on its website that, "It should be made abundantly clear that recalling and sharing questions from exams violates exam security, professional ethics and patient trust in the medical profession. When it happens, the practice should be addressed swiftly and decisively. Whether someone is providing or using test questions, ABMS Member Boards enforce sanctions that may include permanent barring from certification, and/or prosecution for copyright violation."

CNN has confirmed the practice also exists with dermatology, where the recalls are known as "airplane notes," because residents write down as much as they can remember on the plane after taking the test.

Although he's been under house arrest in Britain, WikiLeaks founder Julian Assange will nevertheless have a cameo in an upcoming episode of "The Simpsons."

The controversial figure will voice the "Simpson-ized" version of himself in the 500th episode of the long-running series, which will air February 19.

Entertainment Weekly reports that Assange will serve as a sort of "new Flanders" for the animated family after they "go off the grid" once Marge and Homer learn that Springfield's residents have been holding secret meetings to try to kick them out of town.

FULL STORY

CNN’s Kaj Larsen examined Julian Assange for CNN Presents: “WikiWars: The Mission of Julian Assange."
Click to watch a clip from WikiWars

On any given Friday at countless American high schools over four million kids are playing tackle football. Those kids are going head to head and helmet to helmet. But this isn't all fun and games. This sport can be as dangerous as it gets.

Just ask the team at JH Rose High School in North Carolina. Three years ago, the worst happened to this championship team. A tragedy they've little explored, until now. There's a price to be paid by these players on the front lines and lessons to be learned from their experience.

CNN's Senior Medical Correspondent Dr. Sanjay Gupta spent the season with the Rose Rampants, a team trying hard to turn tragedy into triumph. But can they win games and stay safe?

You'll meet players, families and doctors who will tell you something you might not want to hear.. but its something that may just save our kids.

"Big Hits, Broken Dreams" premieres this Sunday at 8:00 pm ET, replaying at 11:00 pm ET and 2:00 am ET.

With the highest homicide rate in the world, Honduras has become the apex for drug trafficking in the region.

In this segment, CNN’s Kaj Larsen gives you an extremely rare behind-the-scenes look at an overseas operation headed by the U.S. Drug Enforcement Administration.

Larsen follows the head of the DEA in Honduras who, with the help of just two other DEA agents, is trying to stem the flow of an estimated 25 tons a month of cocaine bound for the U.S.

Narco Wars is one of two riveting stories you won’t want to miss on CNN Presents this Sunday at 8:00 pm ET, reairing at 11:00 pm and 2:00 am.