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For the past two months, cyborg police officers have screened travellers passing through Zhengzhou railway station in China. The officers, wearing smart glasses with built-in face recognition, have caught seven fugitives and 26 fake ID holders already. According to local media, some of the fugitives were wanted for alleged involvement in human trafficking cases.

Zhang Xin, at LLVision, the firm that developed the GLXSS Pro smart glasses, says the glasses are very light so the police officers can wear them all day. Feedback so far been positive, she says.

The face recognition feature is 99.4 per cent accurate, according to LLVision. If a match can鈥檛 be found then the officer can transfer their photo of someone鈥檚 face over the internet for checking against a central database.

In total, police in the three Chinese provinces of Henan, Shandong and Xinjiang are currently using the technology. Some highway patrol officers are using it when checking drivers鈥� licences for instance, but the system offers licence plate recognition, too.

LLVision has kept the weight of the glasses down by connecting them via wire to a separate device with a screen. It looks a bit like a smartphone and contains an external battery, allowing for the glasses to be used for about 10 hours at a time.

Smart glasses have moved on from the days of Google Glass, points out Jim Kovach at CrowdOptic. 聽鈥淭hey are less conspicuous, the battery life is much better now 鈥� a lot of things have been solved since those early days,鈥� he says.

He adds that his firm is fielding strong interest from authorities in Australia who might use similar systems at ports and points of entry: 鈥淭he whole country is really fired up about this.鈥�

There are also reports that police to spot criminals. George Jijiashvili, at CCS Insight, says US police departments have undertaken trials in the past. Though there may be some resistance among the public, he says it is likely US and European police forces will start using smart glasses more regularly soon.

There are reasons to be cautious about equipping police with face-recognising smart glasses, says Paul Bernal at the University of East Anglia. While the technology may make it easier for the police to catch criminals, it could also be used for more nefarious purposes such as intimidating protestors.

鈥淲e [in Britain] still feel safe and comfortable 鈥� and when you feel safe and comfortable you trust authorities with this stuff,鈥� he says. 鈥淲e鈥檒l suddenly realise it鈥檚 disastrous if the political climate changes.鈥�