Term used to describe the process of locating a person's whereabouts for any number of purposes, ie service of process, witness location, debt collections, bail bond enforcement.

The coordinated hidden surveillance of a location or person for the purpose of gathering evidence.

Notice is the legal concept in which a party is made aware of a legal process affecting their rights, obligations or duties.

In civil lawsuits or prosecutions there are many proceedings that require formal notice or writ used by the courts to exercise jurisdiction over a person or property.
Typical serves may include:

• Summons
• Mandate
• Subpoena
• Warrants

Due process balances the power of law of the land and protects individual persons from it.