Actualy good thinking there.. unless the data is not kept in the machines...
If this is the case that the machines DO gather the info, how safe is it to have such machines with personal user data in it?
For now I can't imagine what other people would do with this data if they manage to "steal" it, but I don't know why it would be neccesary to keep the info after the person got his/her info from it.
Could be just printing out some numbers for the doctor and resest for the next user.