my sons school threatend to call dyfs if i dont put him on meds . do they have a right to force this ?

The school can call DYFS now called DCPP, if they feel your child is in danger.  But if there is nothing wrong, and you do not feel he needs medication, then its your right not to give it to him.  The school must believe there is some kind of issue that could be addressed with medication.  You should meet with them to discuss the issue, and perhaps meet with your child's  physician to discuss the medication.  If, after discussing it with a doctor, you do not feel medication is the answer, then at least you will be in a position to tell the school that you have considered it and given it proper attention but have chosen not to do it.