Tossing together a few random skins in my spare time. Not police-related but something to bring a little different to Liberty City.
Here's a pack of LTA Bus skins for Lt. Cain'es Bus v1.3x, based on NYC MTA skins. Included are:
LTA Bus Company (MTA Bus)
LTA Liberty City Bus (MTA NYC Bus)
LTA Left Island Bus (former MTA Long Island Bus)
LTA +Selective Bus Service+ (MTA +SBS+)
You can get the pack at http://www.gta4-mods.com/textures/lta-bus-skins-f22922
Lt. Caine's Bus can be found at http://gtapolicemods.com/downloads.php?do=file&id=288