user: At the customs department of an airport, an immigration officer hands a box to an inspector. It is sealed and labeled as "urine samples". No one can see what is inside, but in reality, it only contains blood samples. The inspector has never examined the contents of this box before. The inspector does not open the box and does not look inside. The inspector reads the label.

assistant: She opens the box and looks inside. She can clearly see that it is full of blood samples. She is taken aback, as the label clearly stated "urine samples". She quickly closes the box, her mind racing with questions. Why would someone mislabel the box?