According to federal court documents, the Transportation Security Administration officers noticed that the woman was shaking as she was being screened at the airport.

She was sent to a private screening room after the machine detected a large mass in her body. The large mass was found to be an item wrapped around her stomach. The dog smelled something inside the item when it was brought in.

Terese White, a flight attendant from Dallas, was taken into custody and told the officers that the item they had found was not what they thought it was.

The item was found to be more than three pounds of the drug.

Ms. White was found guilty of having the drug with the intent to distribute. She will be sentenced in the Southern District of California on March 24. It was not clear if her plea agreement would affect her sentence.

The United States Attorney's Office for the Southern District of California said in a statement that Ms. White admitted that she was trying to use her flight attendant privileges to avoid the more robust security screening process.

A lawyer for Ms. White didn't reply to questions on Tuesday. Mesa Airlines didn't reply to questions on Tuesday.

Drug traffickers use air, land and sea for personal gain, putting people's lives in danger.

Ms. White admitted to flying off-duty from the Dallas-Fort Worth International Airport to San Diego. According to prosecutors, after she arrived at the San Diego International Airport, she left the airport's secure area and headed to Boston.

The "known crew member queue" is where Ms. White tried to skip the security screening. Ms. White was randomly selected by T.S.A. agents to go through regular security instead of the known member line, which led to the officers discovering that she was trying to smuggle drugs.

White admitted that she tried to use her status as a flight attendant to facilitate the crime, according to the U.S. attorney's office.

It was not clear who Ms. White was going to give the drug to. She was trying to bring 3.33 pounds of the drug with her.

According to the D.E.A., the drug is 100 times more powerful than morphine and can kill 500,000 people.