Can facial recognition systems identify people under different conditions?

In China, facial recognition systems are used by various cities to name and shame minor offenders, spot a criminal among a crowd and verify the identities of passengers at airports.

Facial recognition is increasingly being deployed around the world by law enforcement and border control to building management to secure access and improve surveillance. But how good is the technology in correctly identifying individuals under different conditions?

The accuracy of facial recognition systems has come under increased scrutiny as Oakland joined San Francisco in May in banning facial recognition software by city agencies, partly over concerns that the software would throw up false positives.