Which biometric technology would be least favorable for identifying health conditions?

Voice prints would be least favorable for identifying health conditions among the listed biometric technologies. This is because voice prints primarily capture the unique characteristics of an individual's voice, which can be influenced by various factors such as emotional state, environmental conditions, and physical health factors but do not specifically or consistently correlate with a person’s health status.

In contrast, retina scans, facial scans, and iris scans are more closely linked to physiological features that can be more reliably associated with certain health conditions. For example, changes in the retina can indicate issues such as diabetes or hypertension, while specific patterns in the iris may be associated with genetic conditions. Facial scans may also reveal signs of certain diseases, such as skin disorders or even certain cancers, depending on the visible symptoms.

Voice prints do not have this level of diagnostic capacity and are mainly used for authentication rather than health assessment, making them the least favorable option for identifying health conditions.