[WrathOfGenesis]

pawn Код:

public OnPlayerStateChange ( playerid , newstate , oldstate )
{
  if ( newstate == PLAYER_STATE_DRIVER )
  {
    if ( GetPlayerWantedLevel ( playerid ) == 0 )
    {
      if ( random ( 5 ) == 1 )
      {
        SetPlayerWantedLevel ( playerid , 1 );
      }
    }
  }
  return 1;
}

Untested but should work as you wanted.