Unless there was other evidence - CCTV, witnesses, evidence of villas in Spain with no corresponding explanation for where the money came from, then there can have been few if any "safe" convictions.
The trigger for and evidence of practically all such prosecutions generally speaking is that there are false entries or black holes in the accounts. Horizon created both of those things.
The best one can say is that some embezzlers were "accidentally" included. A forensic re-examination of every case would not necessarily separate the sheep from the goats.
The more competent embezzlers might even have got away with it as a consequence of Horizon's failings, e.g. by pocketing spurious "overs" it created.
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