U.S. Private Investigators List

I'm buying a list of USA Private Investigators. I'm interested in the list having the company name, address, contact/executive name, and contacts/executives email address and phone number. Other information you have on the business is a plus. All the above fields are required. Please let me know a count of the information you have, when it was updated and how. I am not interested in data that has been sitting for years. This quality must be decent enough to where the people still work in their job, have a valid email address and can be contacted.