U.S. Customs and Border Protection's Global Entry program is a smashing succcess. I have been a member for a few years, and have personally experienced its principal benefit of rapidly and easily clearing Customs upon arrival in the United States. Applicants must first pass a comprehensive background investigation Not everyone gets accepted, however, and for those people who have applied and been denied, there is an appeal process.
Hundreds of people apply every year to become a customs broker. Customs brokers are licensed by U.S. Customs and Border Protection (CBP). The process requires passing a rigorous multiple choice examination, and then passing a background investigation. For many applicants who successfully pass the examination, they are denied a license because the background investigation revealed a poor credit history and rating. Don't give up hope.