Русско-англо-русский юридический словарь

The Managing Director contended that he had been trading in mobile phones since May 2001 and that he neither knew, nor ought to have known, that the transactions involved were connected with fraud. (hartleyfowler.com)

The fact that the house was built straddling a former quarry was irrelevant as the surveyor neither knew nor ought to have known of the existence of the quarry or the nature of the subsoil. (lexology.com)