An undercover sting called 'Operation Rx TM lands nine people behind bars.
The Hidalgo County Sheriff TMs Department launched a month-long investigation after receiving reports that abortion pills were being sold at several flea markets across Hidalgo County.
According to reports, undercover deputies found flea market vendors selling drugs like Viagra, Cialis, Redotex, and even Xanax without a license.
Authorities told Action 4 News the Viagra pills seized were coated with lead.
The investigation led authorities to nine homes that were being used to warehouse drugs brought from Mexico to be sold at the flea markets in the United States.
The sheriff's department launched several raids.
More than $30,000 dollars in cash was seized along with thousands of dollars worth of illegal prescription drugs in homes throughout Hidalgo County.
On Wednesday, deputies hit four vendors at the Val Verde Flea market in Donna.
Sheriff Lupe Trevino told Action 4 News one vendor had multiple tables throughout the flea market.
The suspects ran a "lucrative business" the sheriff said.
They kept very good records."
"He was running three booths, and was averaging about $5,000 a day, Sheriff Trevino said about one vendor.
Investigators say some of the drugs were brought to the United States from Mexico, and some were purchased online and shipped to homes in Hidalgo County.
In all, nine people were arrested and charged with possessing and/or delivering dangerous drugs:
Juana Amparo Mata 38 years old
Julio Cesar Gonzalez 24 years old
Roberto Trevino Flores 26 years old
Gustavo Alonso Garza 47 years old
Jose Hernandez Romero 50 years old
Miguel Angel Villarreal 25 years old
Alejandro Lira Hernandez 23 years old
Guadalupe Elizabeth Vela 27 years old
Maria Del Refugio Maldonado 56 years old
Authorities want to warn residents to not buy prescription drugs from unlicensed vendors.