Emma, this is simply a question of honesty or dishonesty at the time you were active in this enterprise.It doesn't matter what you found out later. It's what you thought at the time you cashed the cheque, not what you found out afterwards, that matters. If you did not know that there was anything crooked going on when you helped these people in cashing money and sending it on to Ghana, not knowingly helping them in a crime, then you were not dishonest in law, and are not in law an accomplice (lawyers would say 'principal' , because lawyers like to be technical !) in the crime. .You might have been naive, not worldly, an innocent dupe,stupid even, but you're not a criminal or guilty merely because you did something which,did, in fact help someone who was committing a crime.Only if you did so knowing at the time and wishing to help the crook carry out the fraud are you guilty
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The fact that you offered to pay something doesn't alter that. It's a honourable thing to do, when you've inadvertently or innocently but mistakenly caused a loss to someone. Of course,some cynics, ignorant of law and evidence, might say 'that's admitting guilt' but it's not.It's not evidence of guilt in itself because it is equivocal: it could equally have been made for a good motive That is it doesn't go to prove that you knew at the time you were cashing a cheque that you were causing loss to anyone. It's equally consistent with your only finding out afterwards that that was the case.