The San Diego Police Department investigated a burglary reported at DeMaio's campaign headquarters on Black Mountain Road in May, and more recent claims by a former campaign staffer that he was sexually harassed by the ex-San Diego city councilman.
“The San Diego Police Department's investigations of these matters have been very thorough, objective and professional,'' District Attorney Bonnie Dumanis said. “SDPD committed significant resources to the investigations and no stone was left unturned.
“The District Attorney's Office thoroughly reviewed the investigations,'' she said. “We use the same process and standards for evaluating cases no matter who the parties are. Our focus is, and always will be, the pursuit of justice.''
DeMaio, a Republican, is hoping to unseat Rep. Scott Peters, D-San Diego, in the Nov. 4 general election.
During the burglary, computer cables were cut and monitors smashed. Investigators initially said they didn't know if anything was stolen. Recently, however, DeMaio claimed that the Peters camp had received his campaign “playbook.''
Peters said he never saw the document, and that his campaign staff turned it over to authorities.
Former DeMaio campaign aide Todd Bosnich recently contended that DeMaio once masturbated in front of him and engaged in a pattern of sexual harassment against him. Both DeMaio and Bosnich are gay.
DeMaio has denied the claims.
The District Attorney's Office also stated that the state Attorney General's Office had confirmed that there was no illegal conflict of interest in the investigation. Dumanis and DeMaio were both candidates for mayor of San Diego two years ago.
Police Chief Shelley Zimmerman said the allegations against DeMaio “were taken seriously and investigated thoroughly'' by her department.
“The highest level of confidentially was maintained during the entire investigative process, and will continue to be maintained, to protect the integrity of each investigation,'' she said.