They cannot invade your privacy to collect information about you. That means they cannot trespass onto private property, including your property to gather information or take pictures of you.
A private investigator is also prohibited from taking pictures of you through the windows of your home. That means an investigator cannot sit in his or her car on a public road or stand on public property and photograph you inside your private property.
Private investigators are also prohibited from:
Entering your home without you giving them permission
Placing a bug on your phone to listen to your conversations
Putting a tracking device on your car to watch where you go
Pretending to be someone else, such as a police officer or insurance agent
Obtaining unauthorized access to your social media accounts, email accounts or other electronic data – make sure you do not accept friend requests from people you do not know, as the investigator may make a friend request
Making physical threats
Making verbal threats