The roles of a bayliff and a private detective are different, and sometimes complementary. The bayliff certifies his observations, but he doesn’t investigate. Contrary to the bayliff, the private investigator doesn’t have to reveal his status. He will be able to find the place where the facts occur (storage of stolen materials, adultery, etc.). In a nutshell, if the place is known and no discretion is needed, you should call a bayliff. If an investigation is needed, hiring a private detective will be a better solution. In some cases, the detective will allow the bayliff to intervene at the right time and the right place.