def saturated_in_all_groups(pedestal_array):
    """Generate a list of pixels that are saturated in all groups

    Parameters
    ----------
    pedestal_array : numpy.ndarray
        3D array of pedestal values (signal extrapolated to time=0)

    Returns
    -------
    full_saturation : tup
        Tuple of (y, x) coordinate lists (output from np.where)
    """
    full_saturation = pedestal_array == 0
    return full_saturation.astype(int)