In the Line of Duty 4: Witness

In the Line of DutyWitness aka In the Line of Duty is a 1989 Hong Kong action film directed by Yuen Wooping, starring Donnie Yen, Michael Wong and Cynthia Khan. The film was released in the Hong Kong onJuly 1989.

The film begins in Seattle. Seattle police officers Madam Yeung Laiching Cynthia Khan, Donnie Yen, and their Caucasian partner Peter Woods tail a group of Chinese cocaine dealers through a mall. Madam Yeung and Peter tail them to a seaport that night, where a shipment has just arrived from Hong Kong. Chinese workmen load crates into the drug dealers truck. Madam Yeung, in defiance of Peter, acrobatically infiltrates the docks and enters the truck, but is caught by one of the workmen, Luk Wanting Yuen Yatchor. She convinces him that shes a stowaway illegal immigrant from Hong Kong, and he takes her to his nearby attic apartment, where he gives her some money to help her, as he and his brother too were illegal immigrants for seven years. He has just obtained legal ID cards for both of them. She tries to stealthily check in with Peter, who is tailing the cocaine dealers to an unknown location, but Luk grows suspicious and catches her.Just then Luks brother Ming Liu Kaichi crashes in through a skylight, pursued by six armed thugs to whom he owes 20,000 due to his gambling addiction. Luk attacks the thugs to save Ming, revealing that he has some martial arts skill. Madam Yeung joins the fight against the thugs. Together they drive the thugs away. She returns Luks money and leaves. ........

Source: Wikipedia