Raj Shah, a deputy White House press secretary, said Friday that after Mr. Tester’s accusations, officials searched all of the government databases that contain records of accidents involving government vehicles, including at the General Services Administration. He called it a “comprehensive search” for any crashes involving Dr. Jackson and a government vehicle.

Mr. Shah said that the search revealed three episodes, none of which resembled the crash described by Mr. Tester.

In one episode, Mr. Shah said that Dr. Jackson was rear-ended, resulting in a fender bender. In another, a bus sideswiped a side mirror on Dr. Jackson’s car, according to Mr. Shah. The third case was an episode of road rage, Mr. Shah said, in which another person punched through a window on Dr. Jackson’s car.

None sounded like the accusation contained in the document distributed by Mr. Tester: “At a Secret Service going-away party, Jackson got drunk and wrecked a government vehicle.” That allegation was widely reported by news organizations at the time as lawmakers from both parties expressed concern and indefinitely delayed Dr. Jackson’s confirmation hearing.

A spokeswoman for Mr. Tester declined to comment on Friday night.

It was not clear whether the White House’s records search might have missed an episode like the one on Mr. Tester’s list of accusations, or if such an episode might have gone unreported. But White House officials said it would be inconceivable for serious damage to a government vehicle to escape notice and not be recorded.