Here's a snippet from the Iowa Engineering Board rules:
[blue]8.2(6)?Unethical or illegal conduct.
a. Business practices. The following guidelines regarding unethical or illegal business practices shall apply:
(1) Licensees shall not pay or offer to pay, either directly or indirectly, any commission, percentage, brokerage fee, political contribution, gift, or other consideration to secure work, except to a bona fide employee or bona fide, established commercial or marketing agency retained by them or to secure positions through employment agencies.
(2) Licensees, as employers, shall not engage in any discriminatory practice prohibited by law and shall, in the conduct of their business, employ personnel upon the basis of merit.
(3) Licensees shall not solicit or accept gratuities, directly or indirectly, from contractors, their agents, or other parties dealing with their clients or employers in connection with work for which they are responsible.[/blue]