Most insider incidents leave a trail long before impact. Investigators know where to look.
Insider threats rarely appear from nowhere. Anomalous data movement, unexplained access patterns, and behavioural shifts frequently precede an incident by weeks or months. The problem is not detection technology, it is the discipline to correlate signals across HR, IT and physical security.
A structured internal investigation, conducted independently and under privilege where appropriate, protects the organisation legally and reputationally while establishing the facts.