What does someone have to do to stop a private detective from following them?

To stop a private detective from following them, an individual should first calmly confront the detective, asking them to cease their activities. If the harassment continues, they can document the instances of being followed and consider contacting local law enforcement to report the situation. Additionally, seeking legal advice to understand their rights and possibly pursuing a cease-and-desist order may be effective steps. Lastly, consulting with a lawyer can help determine if there are grounds for a lawsuit based on privacy violations.