This sounds likely to be fraught with false positives.
In particular, the language a student uses during an interview can help distinguish a high-risk teenager [shooter] from a low-risk one, according to previous research Barzman directed. That study concluded that the former was more likely to express negative feelings about himself and about the acts of others. He also was more likely to talk about violent acts involving himself and violent video games or movies.
My clique in high school were the metalheads, barely passing nerds, and social rejects. Self-deprecation was the basis of our humor. Violent video games or movies was the basis of our media consumption. The only one of us every accused of fighting was a case of mistaken identity as the first and last (not middle) names matched the very common actual guy of another race.
Artificial intelligence is the tool of choice for this kind of stuff. I hope the research is light years ahead of where this article describes it.