I have never had to employ a private investigator and never had any experience with them; in fact, I work in a police station !!!!!
I think I wouldn’t like to do this job; in spite of I always observe everything amb everyone I usually deal with my own matters and decide at the moment what I want to do.
The most interesting job I have ever had was when I lived in Italy; I worked in a extreme sports import-export company and I met lot of interesting people and travel often.