[member]

It's Very simple. Try this:

pawn Код:

public OnPlayerStateChange(playerid,newstate,oldstate)
{
    new carid;
    carid = GetVehicleModel(GetPlayerVehicleID(playerid));
    if(newstate == PLAYER_STATE_DRIVER || newstate == PLAYER_STATE_PASSENGER)
    {
        if(IsCopCar(carid) && PlayerInfo[playerid][pRank] >= 1) // If Player Enters any Cop Car and is Ranked 1 or less
        {
            SendClientMessage(playerid, 0xFF0000AA, "You cannot use this Vehicle, You need to be above Level 1 - Ejected");
            RemovePlayerFromVehicle(playerid);
        }
    }
    return 1;
}

You'll need to also add Andre's IsCopCar function as well:

pawn Код:

stock IsCopCar(carid)
{
  new Operative[] = { 523, 427, 490, 528, 596, 597, 598, 599 };
  for(new i = 0; i < sizeof(Operative); i++)
  {
    if(GetVehicleModel(carid) == Operative[i]) return 1;
  }
  return 0;
}

Untested.

EDIT: It will stop anyone who enters a cop car and is ranked 1 or less to be ejected. This is not what you want looking at ur original post. I used the variable you gave only for the player ranks. If you want just add/ change the rank to check if the player's not a cop.