Not sure if the following are parts of the same story or parts of two different stories, either way I can't remember title/s or author/s

1. teacher goes ballistic in class, and student who is hearing impaired, and has permission to record lessons for later, records all insults from the teacher.
Later the teacher resigns after hearing her ranting at the school board meeting.

2. Brother or cousin is given a book containing a hidden recording device (I think by a detective firm employed by the family) and records a teacher making insults.

I was reminded of these while rereading ' Through The Years ' and ' The Kelly Anderson Chronicles '