Primary sources only
Every figure on a state page — statute citation, interlock duration, SR-22 period, reinstatement fee, approved vendor — is taken from a primary source: the statute or administrative code as published by the state, or the official page of the state licensing agency (DMV, DPS, MVD, BMV, or equivalent).
Secondary sources are not used as the basis for any value. News reports, law-firm websites, insurer guides, and vendor marketing pages may prompt a re-check, but the record is only updated when the primary source confirms the change.