McMINNVILLE, Tenn. -- Another law officer in a second county has resigned following the raid Monday on the Americare Urgent Care Walk-In Clinic in McMinnville.

The sheriff of DeKalb County told the Channel 4 I-Team one his officers resigned Wednesday -- just a day after that employee was put on administrative leave while being investigated for possible prescription drug fraud.

The search warrant obtained by the I-Team sheds more light on what police said happened at that clinic.

The I-Team first reported how Tennessee Bureau of Investigation agents, Warren County sheriff's investigators and the TennCare fraud division raided the clinic after investigators were tipped off to what's being described as a major operation in which people could illegally obtain prescription drugs.

The I-Team was told four officers are being investigated for being part of the operation: one in Warren County, one in DeKalb County and two officers in the McMinnville Police Department.

"When you work together in our profession, you become more like family than coworkers," said Sheriff Jackie Matheny. "So it hurts."

The officers' names aren't being released, and no one has been charged or arrested.

But documents obtained by the I-Team shed more light on what happened.

A warrant states investigators could find evidence of a crime violating the Tennessee Drug Control Act and the Tennessee Money Laundering Act at the clinic.

It goes on to state how detectives were able to purchase hydrocodone, using an informant, on two separate occasions without a prescription.

The search warrant states the detectives, using the informant, were able to purchase the drugs, from a man named Marcus Northcutt.

Public records show that building is owned by a man with the last name of Northcutt, but not Marcus Northcutt.