When the woman threatened to go the police, Mr. Salgado laughed and said he was too powerful to take down, according to the investigative file opened by the attorney general’s office.
The state’s attorney general at the time, Xavier Oléa, said in an interview that the woman handed over the photos that Mr. Salgado sent her of the rape, and text messages in which he threatened to kill her if she went to the authorities. Mr. Oléa said he thought there was enough evidence to prosecute.
But Guerrero’s governor told him to drop the case, Mr. Oléa said, repeating an assertion he has made to Mexican media outlets. The governor’s spokesman declined to comment.
“He told me not to go forward with it; otherwise the current president would go for his jugular,” Mr. Oléa said, referring to Mr. López Obrador.
A spokesman for the president declined to comment.
In a news release, the Guerrero Attorney General’s office said the investigation into the woman’s claims was “under revision.” The office said Mr. Oléa was “solely responsible for deciding and coordinating investigations” while he was the state’s top prosecutor.
Ms. Castañeda said she filed her own statement with the Guerrero attorney general’s office in November, shortly before Mr. Salgado was named as the candidate. She said she also filed the accusations with the president’s party, which confirmed receiving them in an internal document obtained by The Times. Ms. Castañeda is being represented by Mr. Oléa, the former attorney general, now in private practice.
Last month, the current attorney general’s office informed Ms. Castañeda that it would not pursue her case because the statute of limitations had passed, according to a letter it sent her viewed by The Times. The attorney general’s office did not respond to requests for comment.
“Many years have passed, but I am here,” Ms. Castañeda said. “The pain is still here.”
Oscar Lopez contributed reporting from Mexico City.