Final answer:
A nurse or pharmacist will most likely use fingerprint scanning to verify a patient's identity, which is quick, non-intrusive, and accurate.
Step-by-step explanation:
To verify a patient's identity, the technology that a nurse or pharmacist will most likely use is fingerprint scanning. This method is one of the most widely adopted biometric systems in healthcare settings due to its simplicity, speed, and accuracy. Blood tests are not typically used for identification purposes because they are more intrusive and not as quick as biometric methods. Voice recognition technology is gaining ground but is still less common than fingerprinting for patient identification. A written letter is not a secure method for patient identification in healthcare environments. Fingerprinting in the context of patient identification does not usually involve DNA analysis, contrary to what might be suggested by the reference to the complex DNA fingerprinting process used in genetics and forensics. For everyday patient identification, a simple electronic fingerprint scanner is used to compare the scanned fingerprint with the records in a database to ensure that the right patient is receiving treatment or medication.