Is there a Board or cociation that Recognizes Reputable Investigative Firms?? Or indviduals??

Hello again. I have tried posting a similiar question but I didnt get any answer that were any useful. So I will try to rephrase the question. I am looking for a Private investigator who is Real [ not a small-time scam] And also someone who has ethics. MY Question is : IS There an ociation or Board that Recognizes Private Investigators or Investigative firms for thier Excellence and ethics?? -- If you know Any Names of such ociations/Organizations Please List them.