<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Swanhunter:
Once scanned, the data is checked for naughtiness (i.e reported stolen) and then throws up a warning.</font>
This would indicate that data about stolen/altered passports has to be provided by Interpol. Otherwise, it seems to be difficult for various countries to advise each other about all stolen/lost travel documents.