(NBC) - Tennessee state police have seized more than $1.5 million in suspected drug money found hidden on a "fake" tour bus.

Officials with the 10th Judicial District Drug Task Force say law officers saw the bus weaving in and out traffic.

When they stopped the bus, they found only the driver on board.

The man claimed he was on his way to Indiana to pick up a touring rock band, but couldn't name the town he was supposedly heading to.

A search of the bus revealed bundles of cash hidden inside speaker cabinets.

This is the second such bus the task force has busted in the past six months.

In both cases they found more than $1.5 million.

The seized money is used to fund the drug task force's operations.

Police believe that Mexican drug cartels are using the buses as a cover to smuggle drugs and money.