Internal Investigation Tools manage workplace investigations from Legal's perspective — controlling chain-of-custody, preserving evidence for litigation readiness, coordinating with HR on sensitive matters, and ensuring investigation findings are legally defensible. Core capabilities include case intake and triage, investigation workflow management, document and evidence attachment with chain-of-custody controls, interview scheduling and note management, timeline reconstruction, outcome and action logging, privilege tagging, and export for outside counsel. The category spans dedicated investigation platforms (NAVEX EthicsPoint, Case IQ, HR Acuity) and investigation modules within broader compliance suites.