| english title | In the line of duty 4 |
| original title | 皇家師姐 ４ 直擊證人 |
| aka | Survival / Les Dealers de Hong Kong / La Chinoise |
| french title | Le Sens du Devoir 4 |
| year | 1989 |
| country | Hong-Kong |
| director | YUEN Woo-Ping - 袁和平 | |
| actor | Cynthia KHAN - 楊麗青 | Inspectrice Khan |
| Donnie YEN Chi-Tan - 甄子丹 | Inspecteur Yen | |
| Michael WONG Man-Tak - 王敏德 | Agent Wong | |
| WAI Kei-Sun | ||
| CHO Wing | ||
| John SALVITTI | ||
| Michael WOODS | ||
| LIU Kai-Chi - 廖啟智 | ||
| Lisa CHIAO Chiao | ||
| Paul WONG Kwan | ||
| WONG Kwan | ||
| Sunny YUEN Shun-Yi | ||
| YUEN Yat-Choh | ||
| Eddie MAHER | ||
| producer | Stephen SHIN Gei-Yin - 冼杞然 | |
| action director | Paul WONG Kwan | |
| YUEN Yat-Choh | ||
| CHO Wing | ||
| Donnie YEN Chi-Tan - 甄子丹 | ||
| Sunny YUEN Shun-Yi | ||
| YUEN Woo-Ping - 袁和平 | ||
| scriptwriter | Anthony WONG Wing-Fai | |
| CHEUNG Chi-Sing | ||
| artistic director | LEE Chi-Ngai |
| genres | action kung-fu crime |
| duration | 1h31 |
| shooting studio | D&B |
| production studio | D&B |
| distributor | D&B |
| classification | Hong-Kong:  GB:  |
