Imagine a detective with a limited biological sample, eager to test it with the available technology. The pressure to act is immense, yet the result is inconclusive, stalling the case. Unbeknownst to them, a superior method was on the horizon, but the sample is now depleted. This scenario illustrates the Re-Sequencing Paradox. Testing too early, with the wrong tool, can permanently destroy the only evidence that a future, superior technology could have solved. Last lecture, we established that gaps in a file are data points, not accidents. That point showed us how missing documentation can shape how later investigators read the file afterward. Now the question shifts. What happens when the evidence does survive — but gets consumed by a method that wasn't powerful enough to answer the question? The evolution of DNA testing is pivotal. Early methods demanded large, pristine samples, often yielding no results from degraded material. STR analysis revolutionized this by amplifying short genomic sequences, allowing work with smaller, degraded samples. Imagine RFLP as needing a full paragraph to understand a sentence, while STR can derive meaning from just a few words. DNA degradation is a relentless process. Factors like heat, humidity, and contamination accelerate its breakdown. This degradation compounds over time, making samples unreadable after years. Researchers highlight that degradation, low quantity, and contamination complicate interpretation. The Degradation Constant reminds investigators that the clock on a biological sample never stops. The Material Scarcity Principle guides forensic decisions. Investigators must assess if current technology can answer questions definitively or if waiting for future methods is wiser. In the Herrera case, a small evidence remainder enabled advanced SNP-based analysis, using 600,000 SNPs compared to 20 STR markers. This data density shift is transformational. SNP profiles do something STR profiles cannot do at scale: they reveal relationships across much greater genealogical distances. CODIS searches use STR profiles and require a near-direct match. A genealogical database search using SNPs can surface a distant cousin — and from there, documentary research reconstructs the family tree. But Tina, the DOJ is explicit on this point. A genealogical association is an investigative lead, not an identification. Confirmation requires traditional forensic DNA typing and direct comparison before any arrest is justified. The Herrera case followed that protocol precisely. [emphasis] The Re-Sequencing Paradox is this: the same technological optimism that drives investigators to act can destroy the evidence that a better future technology would have solved. The strongest forensic decision in the 1990s was often to preserve, not to test. Remember the Material Scarcity Principle — calculate the cost of inquiry before consuming what cannot be replaced. And remember that when a CODIS search fails, it does not close the DNA path. It opens a genealogical one. The Herrera files are proof that patience, combined with the right method at the right moment, can reach across forty-five years.