Yes. In most countries and throughout the United States, Private Investigators are legal. Private Investigators are classified under NAICS Code 561611 – Investigation Services for federal, state, and local government vendor opportunities. While some investigative agencies are large — employing hundreds of investigators around the world — most Private Investigators you are likely to encounter will be small sole proprietors or Limited Liability Companies consisting of 1-5 employees serving in a local or regional capacity, like our San Antonio team. Private Investigators or the company they work for must go through the business process like any other business to ensure they are a properly registered business with their state and county