"Launching radioactive material through the Earth's atmosphere brings safety concerns. You have to have a special license to do that, but it is not insurmountable," says Dr Simeon Barber, planetary science specialist at the Open University.
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Its recent trial of age checking software by Persona in the UK has attracted some scrutiny over the vendor's backing by an investment firm co-founded by Peter Thiel, boss of controversial US data firm Palantir.
The unprecedented access shows how these cases are often cracked, not through state-of-the-art technology, but by spotting tiny revealing details in images or chat forums.