The law was supposed to say that Breathalyzers used to gauge alcohol levels in the bloodstream should be calibrated at 1.0, .08 “or” .04, but instead said “and.” The Missouri Supreme Court ruled they had to be calibrated at all three levels.

Supporters of the fix said attorneys used the error to help defendants fend off jail time and fines.

“This was a procedural mistake,” said Rep. Dean Plocher, R-Des Peres, who sponsored the legislation.