pass the roti on the left hand side

I. I saw a programme today on the tele which interviewed young people about what they thought of a school programme that allows them to pay for their food with their fingerprint.  The fingerprint is hashed into a number, which is then stored in a fairly unsecure room on a server, according to a school official.  The school official said that it would be impossible to reconvert the number back into a fingerprint, which the show later pointed out has already been done by a team in Japan.