捜査

1. Origins, structure, and basic meaning

• Structure: 捜査 is read as そうさ and means a criminal investigation in which police or another authority seeks evidence and identifies what happened or who was responsible.
• Basic usage: Use 事件を捜査する for investigating a case and 捜査の進展 for progress in an investigation.

2. Common pitfalls and similar expressions

• Difference between 捜査 and 調査
  • The former is an official investigation of a crime, whereas the latter applies broadly to inquiries conducted to establish facts.