When checking IDs to identify minors, how can micro and rainbow printing on the new British Columbia Drivers Licenses and Identification Cards be most helpful?

Question: When checking IDs to identify minors, how can micro and rainbow printing on the new British Columbia Drivers Licenses and Identification Cards be most helpful?
  these images contain ID information that can be read by card readers
  these images can only be seen under black light to identify authenticity
  these are printed in a unique pattern and are only visible under a magnifying glass for security reasons
  these are stamped, holographic imprints that are only visible using a laser light for additional security

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these are printed in a unique pattern and are only visible under a magnifying glass for security reasons