Verifications concerning infidelity suspicions. Adultery: photo-video-audio evidence. Pre-and post-marriage checks (morality, seriousness, frankness, vices, passions, previous or parallel relationships, checks concerning children from other relationships or undeclared children, patrimony, undeclared health problems existence, origin, ethnic group, religion). Data and information concerning the conduct, morality and loyalty of a person before the conclusion of a marriage.