They suspected tampering, said Tesoro's principal, Dan Burch, and contacted the sheriff's department later that day.
The indictment accuses Ms. Bost of witness tampering, saying that she told Mr. Fuller to give false and misleading information about the $1,500 to law enforcement authorities.
The Holt campaign has repeatedly denied accusations of vote tampering, saying they are meant to cast doubt on a Holt victory.
"We were genuinely surprised at the basic level of the exploits" that allowed tampering, said Mr. Wertheimer, a former security expert for the National Security Agency.
Kidd Warned About Tampering N.B.A. officials warned the Nets and their new point guard, Jason Kidd, that his comments about attracting his former teammates Shawn Marion and Antonio McDyess to New Jersey violated league rules against tampering, said Brian McIntyre, an N.B.A. spokesman.
Some Democratic leaders expressed concern over the allegations of vote tampering, saying the charges might be an effort to subvert an eventual Holt victory by throwing the final decision to the Republican-led House.
A Westchester County grand jury indicted a California man today on charges of forgery and computer tampering, saying that he crashed the computer system of an Irvington-based computer design company by using it to relay tens of thousands of e-mails offering pornography and get-rich-quick schemes.
Federal authorities, who for a year have been investigating Armstrong on suspicion of crimes relating to doping, are looking into whether the encounter between Hamilton and Armstrong on Saturday night constitutes witness tampering, said a person briefed on the matter.
"Our detailed analysis of Oswald's pose, the lighting and shadows and the rifle in his hands refutes the argument of photo tampering," said senior author Hany Farid, a professor of computer science and a pioneering researcher in digital forensics whose team develops mathematical and computational techniques to detect tampering in photos, videos, audios and documents.
"Falsely denying guilt in a conversation with a friend or a colleague who then testifies is not usually treated as obstruction or witness tampering," said Gerald Lynch, a law professor at Columbia University.
