A toxicology report done as part of Aaron Hernandez’s autopsy following his April 2017 suicide in a Massachusetts prison “came back negative for all substances tested to include synthetic cannabinoids,” according to a report issued two weeks after his death by the Massachusetts State Police. But the report redacted an interview conducted with a fellow inmate who told police that Hernandez spent the last days of his life smoking K2, a synthetic drug that can cause hallucinations and psychosis and can be difficult to detect in routine drug tests. The Boston Globe obtained the unredacted police report and published its findings Tuesday.