def process_confidence_threshold(netblock_list, threshold):
    """Returns results that are greater than given threshold.

    Args:
        netblock_list: A list of netblocks with identifying information.
        threshold: The threshold at which confidence scores lower than
            this number should be excluded.

    Returns:
        A modified netblock_list that excludes all netblocks with a confidence
        score less than the threshold.
    """
    return_list = []
    for sub_list in netblock_list:
        if sub_list[4] >= threshold:
            return_list.append(sub_list)
    return return_list