No illnesses have been linked to this case, said Dr. David Acheson, FDA's associate commissioner.
CNN: California plant recalls 1 million pounds of pistachio products
"I think we're talking not days, weeks or even months, but years, " Acheson said.
But Mr Acheson said that both Mr Fraser's claims had proved to be lies.
BBC: Kent huntsman Brian Fraser 'tried to kill ex-girlfriend'
The FDA's Acheson says it would have weighed heavily on his conscience not to warn so broadly.
Wait until an inquiry into possible salmonella contamination is further along, advises FDA Associate Commissioner David Acheson.
President Harry Truman's Secretary of State Dean Acheson entitled his memoirs of the era, Present at the Creation.
As well as highlighting his own plight, Mr Acheson is also campaigning against the blacklisting of other workers.
BBC: Anti-blacklist campaigner Steve Acheson's picket pledge
Dean Acheson, who was Secretary of State in the Truman Administration, aptly entitled his memoirs, Present at the Creation.
Still, Acheson added, the low levels of contaminants means that there is "no imminent threat" to the public health.
Raw pistachios are roasted to a temperature that should kill salmonella, Acheson said.
CNN: California plant recalls 1 million pounds of pistachio products
"We were the only people for many years to employ Mr Acheson on the Fiddlers Ferry project, " he added.
BBC: Anti-blacklist campaigner Steve Acheson's picket pledge
Ian Acheson, prosecuting, said Ms Leggatt initially told police she thought it was her ex-husband who had shot her.
BBC: Kent huntsman Brian Fraser 'tried to kill ex-girlfriend'
You can check in a list of authors at the back that the writer was indeed Dean Gooderham Acheson (1893-1971).
Mr Acheson has argued the 40 subscribers should have faced a harsher punishment - they were given a warning by the ICO.
BBC: Anti-blacklist campaigner Steve Acheson's picket pledge
The Clinton policy was ambiguous about our security perimeter in the region, recalling Dean Acheson's tragic misstep concerning South Korea in 1950.
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The food will not be allowed into the United States until the importer can prove it is free from harmful contaminants, Acheson said.
Acheson added that the Setton Farms recall is related to the one announced Friday by Kroger, a grocery store chain with stores in 31 states.
CNN: California plant recalls 1 million pounds of pistachio products
Acheson stressed at a news conference Monday that the potential problems with pistachios were unrelated to this year's recall of peanut products, including peanut butter.
Acheson stressed it takes long-term exposure to cause serious health problems.
In a subsequently notorious speech given before the conflict, Secretary of State Dean Acheson conspicuously left out South Korea as an area of our vital interests.
Richard came of an age looking up to the men who had helped shape the post-war world -- Dean Acheson, Averill Harriman, Clark Clifford, Dean Rusk.
Acheson emphasized that unlike the recent case of salmonella-tainted peanut butter, this recall was not prompted by an sickness outbreak, saying the decision was a "proactive" move.
CNN: California plant recalls 1 million pounds of pistachio products
It has set up a review headed by Sir Donald Acheson, a former chief medical officer of health, to examine evidence on inequalities and make recommendations for action.
But as Mr Acheson, from Denton in Greater Manchester, is pledging to continue his picket until he gets a job, it would appear he may face a long wait.
BBC: Anti-blacklist campaigner Steve Acheson's picket pledge
An import alert for all 46 shipments of vegetable protein from China to the United States remained in place, and those products have yet to be proven melamine-free, Acheson said.
When reporters ask him questions designed to discover whether he really has read James Chace's biography of Dean Acheson, he shouldn't answer with some foreign-policy boilerplate from his stump speech.
Mr Acheson said Ms Leggatt and Mr Fraser had got together in 2006, but their relationship deteriorated and by 2011 he had moved out of their home, although remaining in touch.
BBC: Kent huntsman Brian Fraser 'tried to kill ex-girlfriend'
"In order to get cancer in lab animals you have to feed fairly high levels of the drug over a long term, " said Dr. David Acheson, the FDA's assistant commissioner for food protection.
"Ultimately, the question is what should consumers do, and our advice to consumers is that they avoid eating pistachio products and keep checking the FDA Web site for the latest information, " Acheson said.
It stated that while Mr Acheson had been monitored on the blacklist while working at the site, BMSL had not been involved in a blacklist or had in any way been influenced by it.
BBC: Anti-blacklist campaigner Steve Acheson's picket pledge
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