Tennessee Legislation

Year of last legislative change: 2016
Year of last revision to administrative code: Awaiting data
Most challenging aspects associated with introducing and passing interlock legislation:
It is difficult to draft bills, make changes, and introduce legislation. There is a very long process each bill has to go through because there are proposals, approval, and the need for a certain number of legislators to back a bill. It often takes 3-5 years for a bill to be passed, which sometimes means it is outdated by the time it is passed. It took nearly seven years for the rules and regulations to be introduced. Also, Public Safety is only allowed to promote two-three bills each year, and there are competing priorities. The main pushers for interlock legislation are the manufacturers.
Changes for program improvement being pursued:
Changes in oversight and IID requirement
Who is eligible for an interlock in your state according to legislation (Data provided by CIIM):
All impaired drivers
Can impaired drivers 'wait out' their interlock requirement:
Is an interlock required on test refusal:

Program Authority

Type of program: Awaiting data
Agency/agencies with authority over the interlock program: Awaiting data
Agency/agencies with authority over participant monitoring: Awaiting data
Agency/agencies with authority over sanctioning interlock program participants: Awaiting data
Agency/agencies with authority to approve devices: Awaiting data
Training available for judges, law enforcement, and lawyers:
DPS training for judges, attorneys, court clerks and cadets

Program Features

Hardship license available to first offenders: Awaiting data
Hardship license available to repeat offenders: Awaiting data
Hardship license (First offenders, Repeat offenders, All): Awaiting data
Lookback period: Awaiting data
Source of funding: Offender fees
Indigent funding is available to participants: Yes
Qualification requirements for indigent funding: Annual income is 185% or less of the US poverty guidelines
Frequency of interlock device service: Awaiting data


Participation Rate: Awaiting data
Number of interlock program participants in 2019: Awaiting data
Indicator used to determine the number of participants in the interlock program (e.g., certificate of device installation, certificate of device removal): Awaiting data
Indicator(s) used in state as the best measure(s) of the eligible population of offenders for the interlock program to determine the program participation rate: Awaiting data
Penalties for non-compliance: Awaiting data

Program Length

Length of Hard Suspension

1st offenders: 12 months
2nd offenders: 24 months
3rd offenders: 60 months
4th and subsequent offenders: 96 months

Interlock Program Length

1st offenders: 6 months
2nd offenders: Awaiting data
3rd offenders: Awaiting data
4th and subsequent offenders: Awaiting data


Program length is extended for non-compliance: Awaiting data
Length of extension for non-compliance: Awaiting data
Program length is reduced for compliance: Awaiting data
Length of reduction for compliance: Awaiting data
Frequency of sanctions imposed for non-compliance: Awaiting data
Program exit requirements: Compliance-based removal


Treatment is required for the interlock program: Yes
Components applied to treatment: Yes

Data Collection & Management

Agency responsible for collecting data: Awaiting data
Overview of Data Management: Awaiting data
Barriers to data collection: Awaiting data
Vendors in State

Vendor Oversight

Number of Vendors in State: 6
Agency responsible for vendor oversight: Department of Public Safety
Approval process for new vendors: Vendors must meet the NHTSA requirements, complete an application process, and agree to making their data accessible via our electronic database. It usually takes about a month to complete this process, inspect service centers, and ensure they work well in other states.
Vendor recertification: Awaiting data
Interlock technology features (Data provided by CIIM): Camera, Real-time reporting
Radius requirement for service centers: Yes
Radius requirement: 100-miles