A Latham, Mo., woman pleaded guilty Tuesday in federal court in Jefferson City in connection with a drug investigation from January 2010.
According to the U.S. Attorney's Office, Amber Rose McGhay, 27, pleaded guilty to possession with the intent to distribute methamphetamine.
Sentencing will take place at a later date.
According to court records, authorities found out there was a group of individuals distributing large amounts of methamphetamine in Cole and Moniteau counties.
Those involved would travel to the Kansas City area and return on Sundays with methamphetamine.
Authorities set up surveillance points in Cooper and Morgan counties along the route likely to be traveled from Kansas City to Tipton.
A truck, which was titled to McGhay, was pulled over on Missouri 5, south of Interstate 70 in Cooper County, for a traffic violation.
A search of the truck found drugs, drug paraphernalia, cellphones, a radar detector and more than $500 in cash.
The cellphones recovered revealed information about drug trafficking.
Some of the text messages were identified as being sent by McGhay.
She later admitted to authorities she had sent those messages.
McGhay advised she used some of the methamphetamine, and had three or four customers to whom she would sell the rest.
McGhay also advised she would profit around $100 per sale and admitted making trips to deliver methamphetamine.