The legislative intent of the law was that school districts would no longer limit a student's access to pedagogical instruction in music or any other academic subject for test preparation and remediation. The law, in fact, requires local boards of education to establish such a policy. Many have not done that, so you may want to start by asking where that language exists in your local district policy.
Hopefully many districts are following law because it is the right thing to do. For those in violation, there are success stories from our members who shared the law with their administration and they adjusted, but we do not have hard data on such transformations.
Having said that, I know many of you are dealing with these frustrations today because your district chooses to break the law, skirt it, or ignore it.
If you are having this problem I encourage you to email me at email@example.com, and I will give it my best shot to help.