Capture evidence while features are accessibleBuried-via verification is planned around accessibility. Product qualification uses the agreed construction and acceptance documents.Capture evidence while features are accessibleA release gate is a check, not an extra sales claim1Before enclosureVerify internal pattern and drilled/plated construction.Record the subassembly identity and drawing revision.2At fill or preparationInspect the required treatment before overbuilding.Identify what is measured and where samples are taken.3After laminationCheck the final geometry and electrical connections.Final continuity does not prove every hidden interface is sound.4At qualificationAgree stress, coupon and section evidence where needed.Tie results to the material, stackup and actual via structures.³Ô¹Ïtv · Engineering illustration · Conceptual, not to scale