noun
police legwork; canvassing; house-to-house inquiry
Police investigation method where officers visit homes and businesses to question neighbors, bystanders, and local residents to gather information.
警察は事件の手がかりを得るため、聞き込み捜査を続けている。
The police are continuing house-to-house inquiries to get clues about the case.
聞き込み捜査で目撃情報が集まった。
Witness information was gathered through canvassing.
Compound of 聞き込み (listening and gathering information) + 捜査 (investigation).