Private investigation firms are businesses that provide investigative services to individuals, companies, and legal professionals. They often handle cases such as infidelity, missing persons, and background checks. These firms employ licensed private investigators who use various techniques to gather information and evidence. The work of private investigation firms can also include surveillance, fraud investigations, and asset searches. They may assist in legal matters by providing evidence for court cases or helping clients find missing assets. Overall, these firms play a crucial role in uncovering information that may not be easily accessible to the public.