Parental involvement in schools

Recently a principal, of a school with decent API scores, good PTA membership (300 paid members) and Distinguished School Award, recently used a stone wall tactic to prevent parents from volunteering in the classrooms.

You should know that while the PTA at this school has more than 300 paid members, only 25 members regularly attend the meetings. At a recent PTA meeting the principal had the teacher who represents the teachers union at the school to share the following: The top of the flyer he was reading stated thank you for visiting our school. To minimize classroom disruptions please respect the following rules: Education code 51101.
The flyer and speaker went on to read: Parents may observe the classroom and visits are no usually longer than 30 minutes, the parent may volunteer with the approval of the teacher, visitors cannot enter the classroom without permission or an appointment. Later it states that any parent that visits more than once should have a volunteer form completed with the district.

My response to this is there is an Education Code that states some of these things but not all. Furthermore I would argue that the principal is misreading the law. The presentation of the information seems to be an attempt to keep parents out of the classrooms.

According to No Child Left Behind: Parent Involvement Policies in NCLB The No Child Left Behind Act may help. Schools that receive Title I funds must meet with parents to develop a parental involvement policy and must distribute the policy to parents and the community. Parents of children who attend Title I schools shall have access to school staff, opportunities to participate in the child's class, and to observe classroom activities. (20 U.S.C. § 6318) The school must hold a meeting every year to tell parents about the parent involvement policy and their right to be involved in their child's education.

Parents have a right to access to teachers, opportunities to volunteer and participate in your child's class, and to observe classroom activities. (Wrightslaw: No Child Left Behind, page 39, 58-59, 80, 194-198) If the child attends a Title I school, parents have a right to inspect instructional materials used in the curriculum. (Title X, Section 1061) (Wrightslaw: No Child Left Behind, page 39)