The LSPD pack is a skin pack which gives many vehicles ... functioning siren and police radio which can be toggled to every car it reskins. There are around four versions of the skin pack ...

The Legacy LSPD Mega Pack mod adds police variants of numerous cars in Grand Theft Auto 5. The Taurus, the Charger, the Explorer, and the Tahoe are some of the vehicles included in this mod pack.

GTA Online Dispatch Work provides you with another opportunity to collaborate with LSPD Officer Vincent Effenburger ... so you can't just steal a random cop car to shortcut through the process.