Yes, Mr. Kennedy believes that there is enough evidence to merit further investigation into a link. 

See the works of:

• Dr. Peter Breggin, MD [62]
• Dr. David Healy, MD [63]
• Dr. William J. Walsh, PhD [64]
• Dr. David Kirschner, PhD [65]
  

[62] https://breggin.com/Dr-Peter-Breggins-Scientific-Papers
[63] https://davidhealy.org/articles/
[64] https://www.walshinstitute.org/researchstudies.html
[65] https://web.archive.org/web/20141022124124/https://www.nationalpsychologist.com/2014/09/mass-shooters-received-only-limited-treatment/102638.html

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