With this mod you can add drug dealers to san fierro, las venturas, desert and countryside. 

Hispanic dealer will be in San Fierro. 

BIKDRUG will be replaced by PSYCHO skin. 

PSYCHO appears in countryside and desert. he is not always appears immediately, but after some time and it works without cleo script. 
to make him appear faster in Dillimore, Blueberry and Anglepine, you can use cleo script COUNTRYSIDE_DEALER.cs save game once with script and then remove it from cleo folder

LOS_SANTOS_DEALER_FIX.cs add dealer to Elcorona, Richman and Rodeo 

SANFIERRO-DEALERS.cs  add dealer to San Fierro streets 

VENTURAS-DEALERS.cs  add dealer to Las Venturas streets. but not on the main Strip.

GANG_ZONE_FIX1.cs  add Gangs around Four Dragons Casino, Caligulas casino, Whitewood Estates and Da Nang Boys to Esplanade East in San Fierro

INSTALL MOD
Put files from Data folder to your game data folder and agree to replace

Put files from Cleo folder to your game Cleo folder, save game once and then remove .cs files from cleo folder. 

The save file will save the changes to the zones for dealers and gangs 