Text book reviews and evaluations are public and go through state boards. CSCOPE is worse because it was adopted by 3/4 of Texas school districts as supplemental instructional material - so no public oversight. And the teachers are FORBIDDEN to give parents lessons and lesson plans. You find out what they teach when your child brings the graded test home.
Fortunately the Texas legislature is correcting that oversight with new legislation to put those materials under the jurisdiction of the SBOE. A couple of friends of mine, who are concerned mothers, have spent lots of time testifying before the Texas legislature on this issue.