From Snopes, and similar fact-checkers:
Claim:
Joe Biden lied in claiming that the accident that killed his wife and daughter involved a driver who had been drinking.
Rating: mixture
What's True
Biden has at least twice publicly stated or suggested that the driver of the truck that struck his wife's vehicle, killing her and the couple's daughter, had been drinking, even though the driver was not charged with drunken driving (or any other infraction suggesting fault on his part).
What's False
No definitive evidence exists to prove or rule out whether the other driver had been drinking, and belief that drinking had contributed to the crash was reportedly prevalent among the local community and not something Biden simply made up on his own.
Does this mean Biden was untruthful — even lying, perhaps — when he implied that Dunn had been drinking? According to Lou Angeli, the fireman who treated Dunn at the scene, no evidence definitively establishes or disproves that point:
In regards to intoxication, there was no way to determine if Mr. Dunn had been drinking, since neither of the police officers had breathalyzers aboard their cruisers. His injuries were such that his demeanor was similar to that of someone in a stupor, but those of you who serve in emergency medicine know that such behavior is often presented by victims who are in shock, or perhaps even diabetic.
All of the records pertaining to this accident are lost. It doesn't surprise me. Back then our ambulance incident report was filled out on a 5x7 card and filed away in a box. Once a month the information was transferred to a master list, which was later placed in storage.
If Mr. Dunn was intoxicated, there was no way to determine that at the hospital either, since alcohol blood tests were not mandatory in 1972. The hospital records are missing, as well as the police reports.
Angeli further asserted that this alleged aspect of the accident wasn't a "lie" Biden simply made up out of whole cloth, and that right or wrong, rumor and belief that drinking had contributed to the crash was prevalent among the local community:
"To be honest,
those of us in fire /rescue here in Delaware assumed that Mr. Dunn had been drinking, based on comments made by police officers at the scene. In the Delaware fire service, rumors travel from station to station like wildfire".
Until he remarried in 1977, whenever Joe Biden attended a public safety event, parade or spoke during a firehouse banquet, police officers and firefighters would approach him and discuss the accident and the tragedy of his wife Neilia and daughter Naomi falling victim to a drunken driver. Imagine how those discussions must have affected the young Senator.
A few weeks after Biden was first elected to the U.S. Senate, his wife and 1-year-old daughter were killed in an automobile accident while Christmas shopping.
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