I agree that you want to investigate and make sure that the IA knows what they are doing. However, as a teacher who works with several IA's, I can truthfully say that if the teacher is designing the instruction specially, implementing that instruction can often be done competently by someone without a teaching degree as long as they are trained by the teacher in what to do. What you don't want is the IA planning the instruction; implementing is basically carrying out orders. I think the IA still needs to be taught what to do by the teacher, however. Saying, "Have the student point to the initial sound of the word as he sounds it out and then quickly move his finger under the rest of the word as he sounds out the rest of the word, like this: s-ail. If he gets it wrong, show him how to do it and then let him try it again," is not the same as, "Do these words with him."
Also, as both a teacher and a parent, I know that sometimes you have to be seen as "pushy" or even "difficult" to get what your child needs. I assume that the teacher wants to do what is right for your child, but you should be able to have that shown to you so that you can rest assured that that is what is really happening.
