AS a further comment, whilst waiting for Richard's answer, I can also point out that all aliens, from late September, are required to provide a fingerprint and be photographed by immigration as they enter the USA. So, their status and ID details will already be known to the immigration authorities and on file.
There may be a duplication of effort here.
As I said, I'm not complaining - just asking for clarification of a situation. Flying is becoming more and more regulated all round the world (look at JAA and EASA), and these latest TSA requirements will probably entail some inconvenience, but that's life now - especially since 9/11 :-(