The Latest Scandal and Tzedaka

I won't get into all the sordid details surrounding the arrest of the mother of 12 in Israel. Many bloggers have already offered their 2 cents and more. But one of the things that struck me was the fact that the father of these children was said to have just returned to the country after spending months abroad collecting for his family. So he would have been one of those people who ask for tzedaka for themselves. Certainly, anyone who gave did so in good faith, but I wonder about this. If the money one gives goes to perpetuate a family life that leads to abuse and actions that clearly fall into the category of yehareg ve'al ya'avor, that would not seem to be a very good use of funds. While the halacha is that on Purim, we give to anyone who approaches without question, that is not the case the rest of the year. Should people really investigate these families that ask for our tzedaka?