If a customer receives an ignition interlock device (IID) violation letter, they should take the following steps: Review the letter carefully to understand the specific violation that occurred, such as a failed breath test or missed service appointment. Contact the IID provider to discuss the violation and any possible issues with the device. Follow any instructions provided in the violation letter, such as scheduling a service appointment or providing additional documentation. Comply with any penalties or additional requirements imposed by the state, such as additional IID use period or fines. Consider seeking legal advice if the customer feels that the violation is unjustified or that their rights were violated. It's important to address the violation promptly to avoid any additional penalties or suspension of driving privileges.