6. Forum: Security Systems

Based on what you heard in the listening task in Section 4 and on what you read in Section 5, what do you think the best security system is out of these:

walk-through metal detectors, passwords, pin numbers, signature verification systems, iris scanning, voice recognition, face recognition, vein scanning, hand scanning, fingerprint scanning.

Why do you think so? What are the pros and cons of the individual systems? Discuss this topic in this forum. If you need more information on the systems before you discuss them, google some facts from reliable sources.