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Then there are also furrin's which this lot also doesn't respect with dual nationality.
There is no guarantee the other countries will agree to revoke that passport as well.
Look at the Begum case- she didn't have dual nationality, but her UK citizenship was removed because the Home Office claimed that she could obtain Bangladeshi citizenship through her parents.
Every NI citizen is a potential dual national, whether they have an Irish passport or not.
De-Britishing NI drug-users would therefore be a) easy and b) provocative, but c) if there's populist benefit from doing it d) they will.
Could get very interesting if one of the groups who have their UK passports removed for drug offences are from Northern Ireland.