Courtroom sketch by Thomas Gianni shows Dennis Hastert standing with the aid of a walker while U.S. District Judge Thomas Durkin asks him questions about molestation.

In court, Dennis Hastert admitted to being a sexual abuser. We hear from some professionals who treat victims of sexual predators about detecting the signs of child sexual abuse.

Courtroom sketch by Thomas Gianni shows Judge Thomas Durkin pronouncing the sentence upon Dennis Hastert.

Dennis Hastert has gone from being the longest-serving Republican U.S. House Speaker to the highest-ranking federal public official to go to jail. He was sentenced Wednesday to 15 months in prison and to two years of supervised release, and ordered to pay $250,000.