Recent studies in dopamine detection prioritize enhancing techniques for superior sensitivity and selectivity, incorporating methods such as electrochem., spectroscopy, and nanomaterial-based sensors.Given dopamine's (DA) essential role in neurol. processes, precise detection is vital for diagnosing and managing conditions such as Parkinson's disease, schizophrenia, and addiction.This study reports the synthesis of Dysprosium-doped bismuth oxychloride (BOCD) nanocomposites, which demonstrated outstanding sensitivity in dopamine detection.Cyclic voltammetry anal. revealed that 7 mol% Dy-doped BiOCl nanocomposites exhibited significant performance, with a detection limit of 0.683μM and a limit of quantification (LOQ) of 2.27μM at neutral pH (7).The modified electrode displayed excellent selectivity for DA even in the presence of uric acid (UA) and maintained strong stability, retaining 92.12% of its performance after 20 cycles.Addnl., BOCD nanoparticles enhanced fingerprint visualization, producing distinct ridge patterns and high-resolution minutiae on surfaces such as aluminum foil leaf and glass.The enhanced contrast enabled the identification of key minutiae, including right loops, bifurcations, and dots, essential for detailed forensic anal.The material also delivered strong pixel intensity contrasts and detailed 3D ridge profiling, supporting accurate forensic and biometric identification.