Participating passengers are asked to scan their passport photo page and have a print taken of their index finger.

CNN: Heathrow tests biometrics

Tech Eye writer Tamlin Magee has checked out the verification process of the app, which required a credit or debit card and scanned photo of a passport, driving license or birth certificate.

FORBES: Facebook Gambling App With Fluffy Creatures Definitely Not Aimed At Kids

Scrapyards that signed up to the scheme request a passport, national identity card or photo driving licence, as well as proof of address.

BBC: Church lead thefts 'drop by 70%' in Cornwall

That technology works best with higher resolution images and a known photo, like a passport or driver's licence, with which to compare to the footage.

BBC: The Boston Marathon bomber: Caught on film?

The process involves ID verification using a passport, driver's licence with photo-card and a utility bill.

BBC: Losing your identity

Once you send them your passport, driver's license and photo -- you've given them the tools for identity theft.

CNN: Sail the high seas on a budget

Residents must show valid government-issued photo identification, such as a passport, driving licence or consular document.

ECONOMIST: One city devises its own immigration policy

Lots of services offered by its online-access business, MSN, use Passport, such as MoneyCentral and a digital photo site.

FORBES: Where Everybody Knows Your Name

The states' plans require voters to present photo ID like a driver's license or passport to vote, a measure endorsed by the Commission on Federal Election Reform headed by President Jimmy Carter and former Secretary of State James Baker in 2005 to protect the integrity of the ballot.

WSJ: Review & Outlook: Holder's Voter ID Fraud