Possible Clues:

• Spool of tape inserted in class
• Recorder is something worth keeping in court to end of case
• Bungled testcase is on tape!
• Tape and holder
• There's a record there of that class of Indians around the set
• Test case about tape container
• Fixed in social status by video for example
• Bring a radio into class and you can play it
• Recording group interrupts class
• Testcase bungled?