We found one dictionary that defines the word preinvestigative:

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1. preinvestigative: Wiktionary

Definitions from Wiktionary (preinvestigative) ▸ adjective:  Prior to investigation. ▸ Words similar to preinvestigative ▸ Usage examples for preinvestigative ▸ Idioms related to preinvestigative ▸ Wikipedia articles (New!) ▸ Popular nouns described by preinvestigative ▸ Words that often appear near preinvestigative ▸ Rhymes of preinvestigative ▸ Invented words related to preinvestigative