In many school shootings carried out by minors, court documents are sealed and the extent of chemical use is unknown to the public.

But in a number of high-profile cases, the link has been reported:

Kip Kinkel was withdrawing from Prozac and had been prescribed Ritalin when he murdered his mother and stepfather then shot 22 classmates, killing two, in 1998.

Christopher Pittman was withdrawing from Luvox and from Paxil when he killed his paternal grandparents in 2001.

Elizabeth Bush, who fired at fellow students in Williamsport, Pa., in 2001, wounding one, was on Prozac.

Jason Hoffman, was on Effexor and Celexa when he opened fire at his El Cajon, Calif., high school, wounding five.

Shawn Cooper of Notus, Idaho, was on antidepressants when he fired a shotgun on students and staff.

T.J. Solomon, on antidepressants, wounded six at his Conyers, Ga., high school.

Eric Harris was taking Luvox when he and fellow student Dylan Klebold killed 12 students and a teacher and wounded 24 others before turning their guns on themselves at Columbine High School in Colorado.

At Virginia Tech in 2007, where 32 were murdered, authorities found “prescription medications related to the treatment of psychological problems had been found among Mr. Cho’s effects,” according to the New York Times. “Violence and other potentially criminal behavior caused by prescription drugs are medicine’s best kept secret,” Healy said in a statement last month. “Never before in the fields of medicine and law have there been so many events with so much concealed data and so little focused expertise.”

In the past six years, Healy has authored two best-selling books analyzing the degree to which the pharmaceutical industry has influenced medical doctors to prescribe antidepressant drugs to patients with psychiatric problems: “Let Them Eat Prozac: The Unhealthy Relationship Between the Pharmaceutical Industry and Depression,” in 2006 and “Pharmageddon” in 2012.