Downtown (1990)

Police Officer Alex Kearney works in a rich, plush suburb of Philadelphia. When he stops an important businessman and his story of the incident is not believed, he is sent to work Downtown, the most dangerous, crime-filled precinct in the city. Everyone there is sure that this 'by the book', pampered, suburban cop is going to get himself, and whoever is assigned as his partner, killed. Detective Dennis Curren, draws the unfortunate 'babysitting' assignment. But when Alex's best friend is killed investigating a stolen car, Alex throws the book out the window tracking down the killer.