Just another incident to prove how brave and courageous these police officers are in the United States. 
But still, In this case I believe that the police officers were merely following the orders which they received from their superiors. In my honest opinion, the state of Texas does not need $150 in license fee from these two little girls, to make the ends meet. Tax the adults as much as you want, but please leave the children alone.
I agree, if the state law is such then the officers really had no choice. They shouldn't be taxing children, because what I don't understand is how are tax laws applicable towards children who can barely cross the street on their own? How would they possibly know of these laws? All they wanted to do was make some money in order to make their father happy! But still, In this case I believe that the police officers were merely following the orders which they received from their superiors. In my honest opinion, the state of Texas does not need $150 in license fee from these two little girls, to make the ends meet. Tax the adults as much as you want, but please leave the children alone.