noun
on-site investigation; on-site inspection
A formal term for an official inspection or investigation conducted by authorities at a physical location, often used in legal, regulatory, or administrative contexts.
保健所が飲食店に立入調査を行った。
The public health center conducted an on-site inspection of the restaurant.
税務署の立入調査を受けることになった。
We ended up undergoing an on-site investigation by the tax office.
Compound of 立ち入り (entering) and 調査 (investigation).