RIDGEWOOD, N.J. (WPIX) -- On this 10th anniversary of the Columbine High School massacre, words of warning from a local school safety expert that not enough has been done to prevent similar violent attacks.

"There hasn't been a lot of proactive or preventative measures taken in the schools," said Carolyn Reinach, co-founder of Campus Behavioral Health Risk Consultants.

Wolf says anyone can be trained to look for red flags and potentially dangerous behavior. But she urges when they see it, there must be places where they can take that information. Schools should have behavioral intervention teams.

Experts have long wondered if perhaps such a team in place could have spotted trouble in Eric Harris and Dylan Klebold, the students who killed 13 people and wounded 23 others at Columbine High School in Littleton, Colorado.

Ridgewood High in Ridgewood, New Jersey is doing just that with a unique approach. They take the photo of each of their students and put it up on a cafeteria wall. Then every teacher is asked to put a dot by a student they know something about, perhaps that student is on a sports team or in the drama club. The students with no dots are the students that are zeroed in on.

"That's when kids do things that they wouldn't otherwise do if they had some real connection and someone to talk to," says Principal Jack Lorenz.

Lorenz says he and his staff have a strong connection with their students, they even know when they change their haircuts. When they see trouble, he says they move in fast.

Lorenz believes that Ridgewood High's approach in identifying high-risk students in advance and offering them help is more important than extra security, metal detectors or lockdowns in making sure Columbine never happens again.