How do Thai hotels judge that guests eat durian?

Thai hotels can judge whether guests have eaten durian in the following ways:

1, smell. Durian has a strong smell and is easy to smell, so Thai hotels will judge whether guests eat durian according to the smell.

2. Look at this rubbish. Durian has a hard shell and a large stone, which is inedible and easy to identify, so Thai hotels can judge whether guests eat durian by looking at the garbage in the trash can. Durian, alias Shaozi, is a plant of Shaozi in Sapindaceae. Evergreen tree of durian in Thailand, 10-20m high or higher; Branchlets are straight, grayish brown when dry, and the tender parts are rusty pubescent.