A new biosecurity tool can detect lethal DNA sequences even if they come from a species the AI has never seen.
Current DNA synthesis filters can be fooled if someone tweaks a toxin sequence to look like it belongs to a harmless plant or a rare bacterium. This screening system uses a taxonomic shift method to recognize the functional signature of a hazard regardless of its origin. It maintained a 0% miss rate in tests involving toxins from biological families that were completely absent from its training data. This effectively closes a massive loophole that could have allowed for the creation of new, unlisted biological weapons. It ensures that synthetic biology labs remain safe from accidental or intentional manufacture of deadly pathogens.
CRC-Screen: Certified DNA-Synthesis Hazard Screening Under Taxonomic Shift
arXiv · 2605.00074
DNA-synthesis providers screen incoming orders by searching the requested sequence against curated hazard lists. We show that this baseline collapses to a 100% false-flag rate when the hazardous sequence comes from a taxonomic family absent from the reference set: under Conformal Risk Control's certified miss-rate constraint, a low-discrimination signal forces the threshold below the entire test-benign mass. We compose three signals derived from a synthesis order's public annotation: $k$-mer Jac