The attorney general’s attempt to relax rules for calibrating drunken driving testers is facing uncertain prospects after a special master’s report said the proposed revisions would compromise reliability.

After charging a state trooper with falsifying records for allegedly skipping a step when calibrating Alcotest devices, the state petitioned the Supreme Court to find that step was unnecessary. The step allegedly skipped was mandated by the Supreme Court in State v. Chun in 2003.