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AI face detection now counts among the tools that could be used to help adult sites effectively estimate UK user ages and block minors from accessing pornography, the UK’s Office of Communications (Ofcom) said in a press release on Tuesday.

The only foreseeable problem, Ofcom noted: There’s little evidence that the AI method of age estimation will be fair, reliable, or effective.

The UK’s legal age to watch porn is 18. To enforce that restriction, under the Online Safety Act, Ofcom will soon require all apps and sites displaying adult content to introduce so-called “age assurance” systems that verify and/or estimate user ages. Sites and apps risk potential fines if they fail to “ensure that children are not normally able to encounter pornography on their service.”