Machines are now helping write the record. We will start with AI-assisted police narratives: how they are made, how to spot them when they land on your desk, and how to defend against them today (what to demand: drafts, versions, prompts, logs; how to dissect raw media versus polished text). Then we will widen to other machine-generated evidence and close with a court-facing framework for a single Rule 104(a) reliability hearing consistent with the proposed Rule 707.