Private investigators can use this website to search for complaints against numerous companies and products.

Complaints.com is a listing of dissatisfied consumer experiences concerning purchased products and/or services. These experiences are first-hand personal incidents collected by visitors on Complaints.com, and published for the primary benefit of voicing an opinion and obtaining resolution. As Complaints.com is the primary search result for the term "complaints" in Google, posting grievances helps get the word out about complaints and ensures product manufacturers and service providers take notice!
Complaints.com: provides consumers with a forum to voice their experiences enables businesses to resolve complaints allows members to read actual consumer experiences aids consumers in making better-informed purchase decisions assists consumers in complaint resolution from unresponsive companies facilitates businesses in improving products and services helps consumers help themselves get better customer service allows members to see how a business is performing and treating customers.
Who are we?
Launched in May 2000, Complaints.com is a joint venture of Sagacity Corporation and Domain Strategies LLC . It now comprises over 100,000 complaints spread across 50+ categories.

Link:http://www.complaints.com/