The court heard six hours of arguments yesterday and spent several hours deliberating that - and a handful of other cases - before announcing it would issue a decision this morning.
Italian prosecutors asked the high court to throw out the acquittal in the murder of 21-year-old British student Meredith Kercher.
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If the UK position is rejected, the Government could be faced with a choice between remaining in the Customs Union or accepting a hard Irish
The size of the proposed penalty has not been disclosed.
Walter Leroy Moody became the oldest US inmate put to death since executions resumed in the US in the 1970s.