Illinois breath machines used for evidentiary testing must meet Illinois State Police standards under 20 Ill. Adm. Code 1286. Accuracy checks are required at defined intervals, typically every 62 days. Records of each check must be maintained and available on request. The device must be certified and appear on the Illinois State Police approved list. Any accuracy check outside tolerance renders subsequent tests suspect until certification is restored. The operator must hold a current permit. Under 625 ILCS 5/11-501.2, foundational proof of certification, calibration, and operator status is a prerequisite to admissibility. A Chicago DUI lawyer subpoenas maintenance logs to expose gaps.
