IMDB: http://www.imdb.com/title/tt0112442/
Trailer: http://www.youtube.com/watch?v=llsY_TMLc9g

Marcus Burnett is a hen-pecked family man. Mike Lowry is a foot-loose and fancy free ladies' man. Both are Miami policemen, and both have 72 hours to reclaim a consignment of drugs stolen from under their station's nose. To complicate matters, in order to get the assistance of the sole witness to a murder, they have to pretend to be each other. Written by James Hastie <jdh1000@cus.cam.ac.uk>
8/10

Hilarious movie with Will Smith - lots of action and humor.