I noticed during the User Test the issue with my RFID reader. I wanted to check the distance of the Parallax RFID reader.
Parallax RFID Reader is suppose to be able to communicate with RFID tags with 2 to 5 inches, which is definitely more than I need. [Source: RFID Reader Distance]
Apparently RFID readers can be increased with a coil antenna. Resource: Extending RFID Reader Range
I can add a remote antenna to the Parallax RFID, but the reader isn’t mine. I also wouldn’t want to hack a $40+ reader. A possibility: [Source]
Due to time constraints, building my own RFID Reader looks out of the question.
It’s possible it’s the aluminum foil that is causing the RFID to not be as strong. It apparently only effects slightly. Resource: Aluminum Foil Does Not Stop RFID