noun
voluntary investigation; consensual search
A legal term for a search or investigation conducted with the consent of the person involved, as opposed to a compulsory search (強制捜査).
警察は任意捜査として、本人の同意を得て家宅捜索を行った。
The police conducted a house search as a voluntary investigation with the consent of the person concerned.
任意捜査では、被疑者の協力が不可欠だ。
In a consensual investigation, the suspect's cooperation is essential.