noun
Refers to the official process of investigating crimes, typically by police or other law enforcement agencies.
警察は殺人事件の刑事捜査を始めた。
The police began a criminal investigation into the murder case.
刑事捜査の結果、容疑者が逮捕された。
As a result of the criminal investigation, the suspect was arrested.
Compound of 刑事 (criminal) and 捜査 (investigation).