Even though private investigators can go any where that is definitely general public, they aren't allowed to trespass. They can not enter a house, dwelling or setting up that they do not have permission to enter. Should the operator of a house offers them authorization, They might enter the home https://www.ma-am.jp/shop/calendar.cgi?b=https%3A%2F%2Fgrafeia-idiotikon-ereunon.gr&m=184