I wpuld have them NOT taser the pregnant lady.
I already know that. Now define the action you would have take place instead. Bearing in mind that speeding through a school zone is one of those pesky little misdemeanors that can get your or my children killed. And that probably the law in the State of Washington requires either a signature in lieu of bail or posting bond to assure appearance in court.
Now, back to the question at hand: what would you have the officer do?