Help on which beggers to give change to.
The ones with the shopping carts full of belongings.
Food is free at any number of places in the ES at various times of the day or week. These guys do not normally attend because they have their carts full of belongings, which are not allowed - they dumpster dive for food and beg. They most likely sleep outside because most shelters, if not all will not allow them to bring them in. Because they have belongings there is a very good chance that they do not do drugs - they would find someone to buy the items to get the money to buy drugs.
these are also most likely the ones who do not beg for money. they may ask you for a light, and when you go to give them one they will produce an old butt they salvaged from a bus stop.
If I see a person like this sleeping on the street I will slip a fiver under cover or in his cart.