http://www.earthworksaction.org/pubs/LOguideCh3.pdf  

 You may want to ask your landman if he or she is a certified landman, and whether or not he  or she belongs to any professional landmen associations, the largest one being the American  Association of Professional Landmen (AAPL).  Many of these associations have codes of  ethics that landmen agree to follow.  For example, the AAPL Code of Ethics state that:  The Land Professional, in his dealings with landowners, industry parties, and others  outside the industry, shall conduct himself in a manner consistent with fairness and  honesty, such as to maintain the respect of the public.  If you believe that the land professional has used intimidationtactics, or has lied to you during  the negotiations, you should call the landman’s association and report the incident.  For exam-  ple, the AAPL has an Ethics Committee to which you may direct complaints.  Their address is:  American Association of Professional Landmen.  Ethics Committee.  4100 Fossil Creek Blvd.  Fort Worth, TX 76137.  Phone: 817-847-7700.