From the Document: "A warning that someone is planning a school shooting can save lives if it is received and acted upon in a timely manner. Research has shown that individuals who plan to conduct a school attack typically share that information with someone else. These are often peers, such as friends or other students at school. Schools that use planned, systematic techniques for gathering information on threats may be well-positioned to receive tips on planned attacks and respond appropriately. This notion that a warning can save lives is arguably the central premise for developing school safety tip lines and likely one of the key drivers behind a surge in new tip lines within the past few years. By the end of the 2018-2019 school year, about half (51%) of public middle and high schools in the United States had a tip line. Most schools (about 60%) reported having tip lines for three years or less. Tip lines -- designed in many different ways -- offer one mechanism for gathering information on a threat to student or school safety. Tip lines collect information via phone, text message, app, email, or a website; they may involve live interaction, or information may be retrieved following submission. They often, but not always, offer anonymity or confidentiality to the submitter. School administrators, law enforcement, or others may operate tip lines at the state or local level."
Office of Justice Programs: https://www.ojp.gov/
National Institute of Justice (NIJ) Journal (October 2021), Issue 283