You don't have to say anything to them. They have to prove their case on the available evidence. Usually a back calculation is only done is serious injury or fatal cases.
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You don't have to talk to them. But they can use the blood sample to get a BAC calculation.
If it went to court they would have to prove beyond doubt you were over the limit.
Have people been convicted on this - yes. But they still have to prove it.
Can I clarify anything for you about this today please?