By Michael Sauter
January 12, 1996 at 05:00 AM EST

THE GLASS SHIELD Michael Boatman, Lori Petty (1995, Miramax, PG-13, priced for rental) Though rapper Ice Cube cops equal billing, the real stars here are Boatman and Petty, as rookies in a crooked sheriff’s department. Since he’s black and she’s female, they’re the odd ones out in the good-ol’-boy system — so naturally it’s up to them to bring it down. Based on actual events, this latter-day Serpico features too much talk and not enough gunplay to have been a theatrical hit. But its intelligent script (by director Charles Burnett) and Þne supporting cast — including Elliott Gould, M. Emmett Walsh, and Cube as a wrongly accused murder suspect — make for a very snug fit on the video screen. B