Great first post! I have never heard of anyone successfully using a private investigator (Dominicans included) but I'd guess they exist and maybe even make a living off of doing it.
check in Santo Domingo I knew a former FBI guy who had a business .. he was from capital ,, I don't have his contact.but i remember he had a web site.... I had a friend who offer a taxi driver 20mil if he could get pictures of his girl with another guy...
sure enough he got them..to finish the story my friend took his girl to dinner then ask her is this how much you love me and showed her the photos...
In RD, most motoconchos and taxi drivers operate as unlicensed private investigators.