A mouse was caught wandering a Brazilian prison with bundles of drugs tied to its tail. Dione Ferreira/YouTube video screenshot

ARAGUAINA, Brazil, Nov. 5 (UPI) -- Officials at a Brazilian prison said they captured a trained mouse used by prisoners to shuttle drugs and other contraband between cells at the facility.

Gean Carlos Gomes, director of the Barra da Grota prison in Araguaina, said the tiny trafficker was spotted running through a prison corridor with bags of drugs tied to its tail.


The investigation into the drug-smuggling mouse turned up 29 small packets of marijuana and 23 packages of cocaine.

Gomes said officers are reviewing CCTV footage in an attempt to determine who was behind the scheme.

"They attached a hook to the mouse's tail and then used it to carry the drugs and other goods from one cell to another," Gomes told G1. "When the animal arrived at its destination, the prisoner took the mouse and removed the hook from its tail."

A video shared by prison officers shows the tame mouse allowing investigators to pet it on the head.

The mouse was released outside the prison, officials said.