Moreno's interactions with the criminal justice and government systems were investigated, as well as why active shooter "red flags" were not acted on to prevent the rampage.
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After researching hundreds of 911 calls, court filings, government documents, and social media posts, along with interviewing family members and criminal justice experts, the Chronicle found that Moreno told police she wanted to shoot people. Authorities knew Moreno had a mental illness and that she was openly planning a mass attack.
See full coverage of the Lakewood Church shooting.
You can read the full investigation here, along with the Chronicle's takeaways, and an inside look at the investigation.
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In the video above, Chronicle data reporter Caroline Ghisolfi discusses the findings and investigation with ABC13.
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