You didn't mention what Aloha Version you are on.
If you are on any of the 6.x versions, fields were added to programming of a payment key to ask for zip code and/or security code.
The problem with this is in the early version so fo 6.x Aloha didn't really DO ANYTHINH with this information--so it didn't get to the processor to help things link the processing fee or fraud detection.
To the best of my knowledge, it still doesn't go to the processor.
A card that is approved by a processor that is later found to be fraudulent is the responsibility of the processor, not the merchant.