A trigger warning is an early notification of any subject matter which might be considered traumatizing for the audience. It has been particularly common in university lectures and reading lists, and is either issued verbally prior to lectures or presentations, or is part of the syllabus. Trigger warnings have been enormously controversial. According to some estimates, around 51% of academics use trigger warnings. Some universities have begun to require that faculty use trigger warnings before they present potentially sensitive material. Trigger warnings do not seem to help, but rather increase students' anxieties. They also lead to what many psychologists have warned, to a culture of "safetyism" and coddling of the mind. In sum, "Trigger Warning" policies, though well meaning, have failed in study after study, have proven to be largely ineffective and in some cases harmful, and come with a host of negative externalities. This report recommends that universities take steps to limit the use of trigger warnings.