Casper offers a new way to fight dangerous, drug-resistant infections by using precision gene-editing tools instead of traditional antibiotics. The system delivers programmable enzymes that act like "molecular scissors”, targeting and destroying only the harmful bacteria while leaving beneficial microbes unharmed. A companion diagnostic tool uses the same system to identify infections through a clear colour shift in the test sample, enabling rapid detection and treatment. This targeted, scalable approach could help combat antimicrobial resistance in both humans and animals