[Swimmer]

I don't believe anyone but the property owner can tell you your tresspassing. Caretakers can inform you that you are but cannot order you from the property. Tell the caretaker when a police officer says I have to leave I will and not before.

The person that can order you from a property is the person who, when tesifying in court, thier word would be accepted as the lawful person that can order you from a property. In Massachusetts someone who says he is the caretaker would not be that person.