刑事

1. Origins, structure, and basic meaning

• Structure: 刑事(けいじ) means a detective, a police officer who investigates cases.
• Basic usage: It is used for a detective hearing a witness's account or a drama about investigations.

2. Common pitfalls and similar expressions

• から marks the source of an account
  • 目撃者から means from a witness, identifying the person whose account was heard.
• The subject of a drama
  • 刑事ドラマ refers to a drama about detectives and their investigations.