You might recall that after Washington (unauthorized) biographer Kitty Kelley published "The Family: The Real Story of the Bush Dynasty" in 2004, she threatened to sue former Washington Post investigative reporter and author Ronald Kessler after he debunked her charges of drug use by President Bush at Camp David.

Kessler, who wrote the book "A Matter of Character: Inside the White House of George W. Bush," took issue with Kelley's lurid drug charges during an appearance on CNBC's "Capital Report."

Now, in his new book "Laura Bush: An Intimate Portrait of the First Lady," which officially hit bookstores this week, Kessler takes on Kelley's additional claims about past drug use by first lady Laura Bush. In her book, Kelley claimed Bush was "known in her college days (at Southern Methodist University) as a go-to girl for dime bags of marijuana."

The charge provoked uproarious laughter among Bush's friends from SMU, according to Kessler's book, which is the first biography of the first lady to be written with White House cooperation.

"If she was the go-to, I missed that," Kessler quotes Pamela Nelson, Bush's Theta Kappa Alpha sorority sister at SMU. "I was there. She was the go-to for a lot of things that were uplifting."

"In the South, there was virtually no marijuana. It was so new," added Bush's sorority big sister, Susan Byerly Nowlin. "It leaves you in awe that someone would say that."

As for Kelley, she attributed the claim to Robert Nash, identified as an Austin public relations executive who was a friend of "many" in Bush's SMU class. But according to Kessler, Nash later said he did not know any of Bush's SMU classmates, but merely told Kelley he had heard a rumor about her selling dope.

In fact, Kessler writes, Bush knew so little about drugs that when she was discussing Kelley's claims with her White House aide Gordon Johndroe, she mistakenly said the author had accused her of selling "dime boxes" of marijuana.

Kessler, who besides the Post also worked at the Wall Street Journal, calls attention to another claim by Kelley. That one goes that after the Bushes were married, they would visit Jane Purucker Clarke, another one of Bush's sorority sisters, and her boyfriend, Sanford "Sandy" Koufax, the former baseball star, on the island of Tortola in the British Virgin Islands and attend "heavy pot-smoking parties."