The question on the quiz I'm doing asks 'What is the name of the USA's most prominent Detective Agency.' Would I be right in thinking the answer is the FBI?
If they mean private detectives as opposed to government agencies the answer is probably "Pinkertons" established in 1850 it is still operating but is now part of the Swedish company Securitas.
Wow dr john, that was quick! Sadly you've just lost me 10p. A friend suggested the answer you've given me and I thought it was the FBI Thank you for your very speedy answer.