I've heard there are a group of leeches posing as "homeless" people with signs ("In need of money" blah blahblah) who sit at driveway entrances in various plazas in the city I live in (Irvine, CA) targeting unsuspecting victims. I've heard of these people making upwards of $200-300 a day. I've seen these people too - oftentimes carrying a child or infant and sometimes with *boxes* of food to-go piled up next to them because of the many people who decided to give them food rather than money. I've also heard of other city residents threatening these leeches with police calls only to call the police and find that the police will do *nothing* about it due to other "more important priorities" to tend to (though, I'm not sure what those would be given the city's 'astronomical' low crime-rates LOL). So the leeches have grown accustomed to the threats essentially being non-threats.
We also see quite a few solicitors sitting in front of major grocery stores in the city, looking for funds for the "homeless" - I'm a bit wary of those guys too. I'd much rather donate through well-known institutions rather than give money directly to an individual, unless I have an established relationship with said person(s).