Halacha 1: Wild fruits like figs, sea capers, and anise are ownerless and exempt from Demai.
Question 2
What is defined as late produce?
Halacha 2: 'Late produce' is what remains after harvesters leave without a guardian.
Question 3
What is the law for produce from a Gentile?
Halacha 8: A Gentile trader buying from Jews has produce considered Demai, and separates like an Am Haaretz.
Question 4
What if the buyer changes the use?
Halacha 15: Since the obligation to separate begins at purchase for eating, he is not exempt even if he changes the use until he separates properly.
Question 5
How to correct an unintentional purchase?
Halacha 20: Stringent on both sides — separates great tithe and second tithe (stringency of Tevel) and second tithe (stringency of Demai), but not required to give first tithe or for the poor as it may have already been separated.