def _drop_columns(feats, additional=None):
    """
    This function takes a list of features and removes DETAILS and ID.
    The user can provide an additional list to remove more features
    """
    to_drop = ['DETAILS', 'ID']
    if additional:
        to_drop = to_drop + additional
    feats = [feat for feat in feats if feat not in to_drop]
    return feats