Government and public agency records documenting prior incidents at the same location are powerful corroboration for a pattern-of-knowledge argument, and they typically qualify as official records under Evidence Code section 1280, which allows a writing made as a record of an act, condition, or event into evidence if it was made by a public employee within the scope of duty, at or near the time of the event, and the sources of information and method of preparation indicate trustworthiness. Records and testimony from the Alhambra Fire Department established that fireworks had been used or seized in the parking lot nearly every Fourth of July since 1988, and that citations or seizures occurred roughly every year for the five years before the fire. This kind of public agency documentation does two things at once: it corroborates the defendant's own admissions, and it gives a plaintiff a source of proof independent of the defendant's cooperation, which matters if a defendant later becomes less forthcoming as litigation intensifies.