A story that is both sad and madenning. What I have seen and heard about CPS in the USA is that where there is actual abuse CPS doesn't seem to be that zealous but if they are dealing with home schoolers then they pull out the stops.
Because of stories like this one I believe that it is important to know your rights before the first conversation with CPS workers. Rights like you do not have to talk with or give them any information without a warrant based probable cause or sworn testimony. And never let them conduct an interview with your child especially without your presence. There are groups like fightcps.com that be tremendous help with dealing with false cps allegations and it is a good ideal to learn some of this before there is a problem.