Trajan
conscientia mille testes
Generally it means there is no evidence.... in other words.... he's innocent.
I will have to somewhat disagree and engage in a semantics debate with you my dear to make the point.....it means they feel they cannot convict on what they have, not that hes innocent... grand injuries are notoriously supple and frankly a set up for the persecution to go forward more often that not.
Was your use of "persecution" a Freudian slip?