Source of funding: Interlock Device Fund - Offender must pay no less than $50 and no more $100 for each year required to have interlock to ensure the solvency of the interlock device fund (66.8-102.3). All money in the interlock device fund is appropriated to the traffic safety bureau of the department of transportation to cover part of the costs of installing, removing and leasing ignition interlock devices for indigent people. Any balance remaining in the interlock device fund shall not revert to the general fund at the end of any fiscal year.