Dumpster diving can be illegal if the owner reports you to the police. I was a manager of a local restaurant, and did almost have to charge some rainbow people with it. They kept sneaking back to dig old biscuits, eggs and sausage out of the dumpster to eat. This was in July (90 degree temps with high humidity for 5 days) We did NOT offer them free food either as they were non workers, homeless by choice type of people. What they do is travel with as many people they can fit into one vehicle, and dig in dumpsters for food, items they can sell for gas money. They refuse to work for anything. Just pitch tents in farmers fields (not even asking to do so) along the road side, take baths in lakes, rivers etc. Do their clothes in the same places. We get them in the area about every 5 years or so.