Sad but true. At first, after I read your post, I was going to ask how to tell the difference between a person in need and a professional beggar. But then, I realized that some of these "professional" beggars beg because they honestly are incapable of securing and holding down a job.
There are many people who are unemployable for a variety of reasons that we cannot see just by looking at them.
For this reason, I shall continue to give hand-outs to those who ask. I will try my best not to be concerned if they are deceiving or tricking me. I hope each hand-out gives them the opportunity to see that people are genuinely caring, and they can choose to do a good thing with the kindness and money.