Also mentioned is conducting thorough \"personal and professional background and previous experiences of coaches before they are hired.\"

\"Do not simply rely on USA Swimming's criminal background screening; checking driving records and other police records are also important,\" the letter reads. \"Clubs should not only check references from prior employers, but should seek input from other parents whose children previously swam for the coach.\"

USA Swimming's background check system was dealt a blow after it was revealed that a 14-year-old San Jose, CA, girl told her youth pastor that swim coach Andy King was molesting her.

Authorities discovered that King, now 62, had a pattern of sexual abuse that stretched over three decades up and down the West Coast and involved more than a dozen teen female victims.

\"He was a monster,\" said Santa Clara County prosecutor Ray Mendoza. \"He had almost every conceivable sex act.\"

\"20/20\" obtained a letter showing that in Dec. 2008, King's background screening came back successful, despite previous police investigations into his behavior towards young female swimmers and parental concerns, and despite the fact he had repeatedly changed jobs and towns after parents raised questions about his behavior.

WATCH PART 1 of the 20/20 investigation.

WATCH PART 2 of the 20/20 investigation.

\"Congratulations! Your background screening has been thoroughly reviewed and meets the qualification standards set by USA Swimming,\" the letter read.

Wielgus' letter to coaches, following the ABC News \"20/20\" report, said, \"In recent days our sport has been portrayed in a very bad light in the media. Sadly, I have also been portrayed as an insensitive, uncaring administrator and spokesperson for USA Swimming.\"

In his letter, which Wielgus sent to ABC News, he also said, \"There are pieces of the recent 20/20 interview that I'd like to have back, there were important things left out, and there were pieces of the report that were untrue.\" Wielgus did not return requests from ABC News for comment.

Wielgus went on to say, \"As a father myself, it breaks my heart to know that there are children out there who have been taken advantage of by their coaches or others in positions of trust. It reminded me to sit down with my daughters and have a very frank but very important discussion about boundaries and appropriate behavior.\"

CONTACT THE ABC NEWS INVESTIGATIVE TEAM IF YOU HAVE A STORY TO ADD TO THIS INVESTIGATION.

Click Here for the Blotter Homepage.

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