§ 6811. Enforcement and protection of receipts
(a)
Enforcement authority
The Secretary concerned shall enforce payment of the recreation fees authorized by this chapter.
(b)
Evidence of nonpayment
If the display of proof of payment of a recreation fee, or the payment of a recreation fee within a certain time period is required, failure to display such proof as required or to pay the recreation fee within the time period specified shall constitute nonpayment.
(c)
Joint liability
The registered owner and any occupant of a vehicle charged with a nonpayment violation involving the vehicle shall be jointly liable for penalties imposed under this section, unless the registered owner can show that the vehicle was used without the registered owner’s express or implied permission.