if(strcmp(cmdtext, "/duty", true) == 0)
{
//make here that cop thingy like u made it at your script!
/*SetPlayerSkin(playerid, ID);*/ meybe it's not necessary for you..
SetPlayerColor(playerid, 0x0000FFAA);//Blue color for cop!
ShowNameTags(0);//you wount see him on the map! oh or like hustler said.. SetPlayerMarkerForPlayer
return 1;
}