More than 10-thousand gallons of diesel disappeared from a Visalia gas station before the owners hired PI Rocky Pipkin.
Pipkin's team hid in the bushes and caught four truck drivers on the first night of their stakeout. He says the men hooked up a little green device to the card reader to trick the computer into giving them free gas.
Police detained the drivers, but investigators think the device came from someone with an insider's knowledge.
Pipkin said, "Whoever developed it or made it, manufactured it had specific proprietary information that belongs to the manufacturer of the pumps."
Police arrested the owner of a Fresno trucking company. Meanwhile, Pipkin is checking across the country to see if drivers used the device at gas stations along their routes.