Ubuntu Security :: Replace Password With Script Event - From RFID

EDIT: I am now just looking for a way to multi-task in PAM, if at all possible.

Basically I would like to supplement replace my password based logon with and RFID scanner. The output of the RFID scanner looks like this:

Tag Read: 0a006f4757
Tag Lost: 0a006f4757
Tag Read: 2800c48994
Tag Lost: 2800c48994

As you can see I scanned some different RFIDs.

Basically I would like for my logon screen to wait until my script gives the message "Tag Read XXXXX where xxx is the RFID unique ID.

In case I lose my RFID, I would like to also allow me to type my password in.