Which biometric identification method is usually the most expensive to implement?

Eye iris scanning is considered the most expensive biometric identification method to implement due to several factors. The intricate technology required for iris recognition systems involves high-resolution cameras and specialized algorithms to accurately capture and analyze the unique patterns in an individual's iris.

These systems not only require advanced hardware but also entail significant development and maintenance costs. Moreover, the implementation typically demands a robust infrastructure to support the processing of complex biometric data securely and efficiently. The costs associated with iris scanning can be further compounded by the need for proper lighting conditions to enable accurate readings, as well as the training for personnel who will manage the systems.

On the other hand, while facial recognition, signature recognition, and fingerprint scanning do involve technology, they generally utilize more widely available and less expensive components than those required for iris scanning, making them more cost-effective options in comparison. Consequently, iris scanning stands out as the most capital-intensive choice among biometric identification methods.