How to Say "investigate" in Spanish
The Spanish word for “investigate” is “rastrear” — B2 level.
English → SpanishB2
verbB2neutral/formal
a problem or crime

Examples
Es difícil rastrear el origen de estas costumbres tan antiguas.
It is difficult to trace the origin of these very old customs.
El historiador intentó rastrear las fuentes originales del manuscrito.
The historian tried to trace the original sources of the manuscript.
Using 'Rastrear' Figuratively
When used in this sense, 'rastrear' often means 'to go back and find the beginning of something,' similar to following an historical trail.
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