Critical Race Theory is being taught in North Dakota schools by teachers who learned it from teacher colleges and continuing education. Even Christian teachers may be teaching it without needing any text book.
Step 1: Understand CRT better by reading this e-book. The Big Ideas Behind Critical Race Theory (16 pages by may download slow).
Step 2: Watch for the small details of this philosophy in operation through comments by students, teachers and administrators.
Step: 3 Expose it.
Step 4: Determine if it was one of those things that "I just didn't know" or was it from a commitment to the humanism.