Explore a Decade of Dave Cullen's Research
There have been several excellent reports. If you're digging deeper into Columbine killers Eric Harris and Dylan Klebold, or school shootings in general, most of what you're searching for has probably already been organized into these reports (first school shooter reports, then Columbine reports). Most of you will want to start here.
School Shooters Reports
These reports are incredible--which is why I put them first, above the Columbine-specific reports. These were created by some of the best minds in the field, and their research was exhaustive and impeccable. It's a shame how few people are aware of them. All the myths about school shooters are cleared up here. (Eg, most shooter are not loners or outcasts, they rarely "snap," and their is no accurate"profile.")
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I recommend all, but ordered them in what I consider most-useful first.
Note: These links go bad over time, but other sites keep posting the reports. I've updated the links in 2017, but if they go bad again, google the title, which I provide for each:
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Secret service
The Final Report and Findings of the Safe School Initiative: Implications for the Prevention of School Attacks in the United States. U.S. Secret Service and U.S. Department of Education. May 2002.
FBI
The School Shooter: A Threat Assessment Perspective (FBI). Federal Bureau of Investigation. U.S. Department of Justice. Critical Incidence Response Group. National Center for the Analysis of Violent Crime. Mary Ellen O'Toole.
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CDC
School-Associated Student Homicides: United States, 1992 - 2006 (CDC). Centers for Disease Control and Prevention. 57(02);33-36. January 18, 2008.
Columbine Reports
Note: These links go bad over time, but other sites keep posting the reports. I've updated the links in 2017, but if they go bad again, google the title, which I provide for each:
Jeffco
Final Report on the Columbine High School Shootings. Jefferson County Sheriff's Office. CD, May 15, 2000. This flawed by highly useful report will satisfy most needs. It is exhaustive on most details about the case, and impeccable in general. However, there are some glaring omissions, particularly anything about the killers' motive.
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Of course you should disregard this report on anything related to Jeffco's own role in the tragedy, including before, during and after the attack. One noteworthy mistake is the report misidentifies the killer of Danny Rohrbough. See the El Paso report below, which supersedes it on anything involving that aspect of the attack.
One big flaw in the report for users is its terrible organization. It runs the equivalent of close to 1,000 pages, but was released straight to DVD, with no "pages" or page numbers. Much important material is buried in odd places. This Reader's Guide to the Columbine Report is really helpful in sorting through it. It was done by Daryl Lindsey, for Salon, May 17, 2000, who was working with me there at the time.
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Governor's Commission
Columbine Review Commission's Report to Governor Bill Owens Hon. William H. Erickson, Chairman. May 2001. This report was based on an outside investigation, with very useful commentary on Jeffco's role. That will be the chief use of it for most readers.
It was not given subpoena power, however, which greatly limited its ability to perform the intended role. (Its lack of power caused great controversy, which was justified.) For people digging really deep, it also includes lots of additional details on assorted topics.
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El Paso County Report
on Danny Rohrbough
Reinvestigation into the Death of Daniel Rohrbough at Columbine High School on April 20, 1990. El Paso County Sheriff's Office, John Wesley Anderson, Sheriff. April 10, 2002.
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This investigation and ensuing report was in response to great controversy over who killed Danny Rohrbough. They did a very thorough job, and corrected the Jeffco report. Danny's family fully embraced its findings.