Do your homework. Not every corporation that statements to complete investigation is legit. Some take your information, “disqualify you” for the study, then provide that data to other businesses. Check out websites like the Better Business Bureau, Yelp, Reddit and copyright to sift out enough time wasters and poor actors. https://lanecmwwm.mdkblog.com/39368954/new-step-by-step-map-for-case-study-experts