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It is nigh on impossible to make laws retrospective. If you go down that route for one statute you could make criminals of entirely innocent people.
Had they just said that "as of now" anyone without the necessary training cannot ......." then it would be backdating the statute. However I suspect they were frightend by the amount of work involved in actually checking etc. Especially as under Labour the police were there to stop us from photgraphing buildings rather than catch criminals.
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