I think there a scam

I receive letters and offers all the time to get paid excellent cash to participate in studies all relevant to my particular medical conditions, everything from Cardiovascular, Arthritis, Back Pain, it dosen't matter I've been turned down for every study, I don't know if it's a race or gender issue, but if your White, a Male, or have an existing job, just steer clear of this place, they will get all your information, than letters show up in your mailbox for more studies you'll get turned down for. and other medical facilities that will help you as long as you can pay...Acurian may be legit so far I haven't seen it, and probably never will, typical internet sham bullshit, I wish our Government watchdog groups would go after these scoundrels.