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I don't fully understand how people end up in prison over this... If the software says there should be X money in the cash drawer, but there is actually Y mo

I don't fully understand how people end up in prison over this... If the software says there should be X money in the cash drawer, but there is actually Y money, then clearly something is wrong, so you investigate. You get the software to print off a list of every sale made that day with timestamps. You check the stores CCTV so see when every customer came into and out of the store. You cross reference. Most are small stores that probably only see 300 customers all day anyway. If you are a store manager wrongly accused of fraud, of course you can be bothered to do this. It would only take one store to do this to find out that the software was wrong.

ghusbands 3y ago
There were more than 900 convictions, and you think that not one of those accused would have tried to prove their innocence? Typically, when it gets to the point of being an accusation, employees will lose all access to all systems. It's also widely reported that evidence was routinely suppressed and emails conveniently lost. And the software was found wrong in November 2019, when a judge ruled that the software contained bugs, errors and defects, which caused a settlement in that case and a cessation of further cases. The oddest part is that with all these Horizon problems being pointed out for decades and then a judge ruling that it was faulty, there still hadn't been an inquiry until very recently.