district attorney (US)
Refers specifically to the US legal position; not used for Japanese prosecutors.
He was elected district attorney of New York.
The district attorney ordered an investigation into the case.
検事 is a general term for a public prosecutor in Japan, while 地区検事 is specifically a US district attorney.
Compound of 地区 (district) and 検事 (prosecutor), modeled on the English term 'district attorney'.