Bacillus cereus (Bc) group are spore-forming bacteria that include human pathogenic strains, such as Bacillus cereus and Bacillus anthracis. Detection of Bc group spores using selective media is a laborious process that is largely dependent on the laboratory environment. We have examined the application of so-called digital photocorrosion (DIP) GaAs/AlGaAs biosensor for detection of Bacillus thuringiensis (Bt) spores. With the aptamer-based biosensing architecture, we have successfully demonstrated detection of Bt spores in the range between 10 3 -10 5 spores/mL. The ease of operating DIP biosensors, and the potential for sensitive detection in field settings hold the promise of attractive applications of these innovative devices for monitoring the presence of Bc group spores.