Rick Jervis of USA Today details his visit to Santa Fe High School, including security upgrades and the feelings of students.

FBI was warned about alleged Florida gunman, what, if anything, can be done at the school level to prevent mass shootings, and dad who walked 11 miles to and from work gets life-changing gift.

Security expert Lou Palumbo offers tips on how you and your loved ones can stay safe while in public during the holiday season.

Are mass shootings becoming commonplace in America? Psychologist Dr. John Huber joins us with a look.

Emily Taylor from U.S. Law Shield explains why we shouldn't jump to blame guns.

Alex del Carmen from Tarlton State University has a look at the law enforcement response to a mass shooting.

Zusha Elinson from The Wall Street Journal discusses the mass shooting survival courses that many Americans have taken in the wake of the tragedies in San Bernardino and Charleston.