Expert Deduction #12
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The Case
A confidential product roadmap was leaked to a competitor. The document went through four drafts before finalization. Five people touched the document: Niko (author), Amara (reviewer 1), Esteban (reviewer 2), Quinn (approver), and Lucia (administrative assistant). Case file EXPERT-012.
Who leaked the document?
Evidence (9)
#1The leaked version contains a typo: 'recieve' instead of 'receive.' This was caught and fixed in the final draft.
#2Draft history: Draft 1 (Niko wrote it), Draft 2 (Amara reviewed), Draft 3 (Esteban reviewed), Draft 4 (final, approved by Quinn).
#3The 'recieve' typo was introduced in Draft 3 by Esteban's edits and corrected in Draft 4.
#4Niko had access to Drafts 1, 2, and 4. He never saw Draft 3.
#5Amara only reviewed and returned Draft 2. She wasn't sent Draft 3 or 4.
#6Quinn received only the final Draft 4 for approval.
#7Lucia had system access to all draft versions as the file manager.
#8The leaked document contains margin comments in the style Esteban uses. Lucia's copies have no margin comments.
#9Esteban's computer shows an email sent to an external address at 11:52 PM on the night of the leak.