Not guilty doesn't mean innocent. It means "guilt could not be proven", it does not mean "innocence was proven".

Seriously, this is why OJ was found liable for the murder of his wife in a civil case, as they're judged on the balance of probabilities.

And it's why people who have served time, then had a retrial ordered and then found not guilty, can be denied compensation, because decisions on compensation are also done on the balance of probabilities.

So yeah, "not guilty" != "innocent".