It was the June 17th, 2003 NY Times article that quoted it (and where I first read it)... but they got it from a 1999 Rocky Mountain News article...
Which is absolutely amazing considering his son was currently running Tranquility Bay... Here's the full quote from the article
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In a 1999 interview with The Rocky Mountain News, however, Mr. Kay, who at that time had left the Wwasps organization, criticized its programs and staff.
The staff was "a bunch of untrained people," he said, according to the newspaper. "They don't have credentials of any kind."
"We could be leading these kids to long-term problems that we don't have a clue about because we're not going about it in the proper way," he said. "How in the hell can you call yourself a behavior-modification program ? and that's one of the ways it's marketed ? when nobody has the experience to determine: Is this good, is this bad?" Link to full article :
http://nospank.net/n-k52.htm