49 U.S. Code § 14902. Civil penalty for accepting rebates from carrier
delivering property to a carrier providing transportation or service subject to jurisdiction under chapter 135 for transportation under this part or for whom that carrier will transport the property as consignor or consignee for that person from a State or territory or possession of the United States to another State or possession, territory, or to a foreign country; and
knowingly accepting or receiving by any means a rebate or offset against the rate for transportation for, or service of, that property contained in a tariff required under section 13702;
is liable to the United States for a civil penalty in an amount equal to 3 times the amount of money that person accepted or received as a rebate or offset and 3 times the value of other consideration accepted or received as a rebate or offset. In a civil action under this section, all money or other consideration received by the person during a period of 6 years before an action is brought under this section may be included in determining the amount of the penalty, and if that total amount is included, the penalty shall be 3 times that total amount.