barcode_scan2 4.2.1 having Issue with Hash at the end of NY PDF417

[rschabe]

We have customers that scan Driver License PDF 417s to collect the raw data and send to our authentication service.
We then validate against known formats for the issuing states to ensure it matches.
This is beyond parsing based on AAMVA standard. This is best attempt to combat use of fraudulent IDs.
Our customer uses barcode_scan2 4.2.1.
It appears that barcode_scan2 4.2.1 is 'reacting' to the data and possibly altering the result causing the hash to fail.
Any ideas on how this can be rectified?