Mariyah Chernykh, 26, gives her address as in Ontario, Canada but she is a Russian citizen. She and several others have pleaded guilty to a fraud that ties her and several others to a murderous attack on an in-house seminar being conducted in San Bernardino, California. The case demonstrates that assessment of suspicion should not be based on obvious, close, circumstances and the relevance of Know Your Customer rather than the narrow aspects of so-called Customer Due Diligence.