Who has to install one in Indiana
Law: IC 9-30-16; 260 IAC 3-2-1 · read it
For the rule that applies to you, read your court order or the letter from the DMV.
A judge can order an interlock in other cases too. Your court order or DMV letter is what binds you.
Where each company can install in Indiana
You'll go back to the same company's locations for service for the whole order, so check that one is close to where you live and work before you book.
Locations as each company lists them on its own locator (Smart Start, Intoxalock, LifeSafer, Low Cost Interlock, RoadGuard), pulled Oct 2026. Some shops serve more than one company. Alcohol Detection Systems doesn't publish a locator we could read.
Interlock companies approved in Indiana
- In Indiana
- 41 service locations listed
- Nationwide
- On 40 of 44 state lists
- 12 months, filed fees
- $1,460–$1,510
- App rating
- 2.0 from 113 (App Store)
- In Indiana
- 21 service locations listed
- Nationwide
- On 34 of 44 state lists
- 12 months, filed fees
- $1,205–$1,355
RoadGuard
Listed as “RoadGuard Interlock”- In Indiana
- 5 service locations listed
- Nationwide
- On 28 of 44 state lists
- 12 months, filed fees
- $1,273
- Nationwide
- On 28 of 44 state lists
Guardian
Listed as “Guardian Interlock”- Nationwide
- On 16 of 44 state lists
- A Simple Interlock
- Monitech
- A&A Product Company
From the state's approved list (read it). Use a company on this list, or the install won't count. 12-month figures are lease, install and removal from each company's filed or published fee schedule, not Indiana prices; see how we add them up.
Related guides
InterlockCompare is independent and doesn't make, sell or install interlocks. Not legal advice.