Figure 5-18 Mistake-Proofing the Design of Health Care Processes - Figure 5.18. The CO2 detector in this bag does not change colors when the tube is incorrectly inserted into the esophagus Return to Document Current as of May 2007 Internet Citation: Figure 5-18: Mistake-Proofing the Design of Health Care Processes -. May 2007. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/professionals/quality-patient-safety/patient-safety-resources/resources/mistakeproof/mistakefig5-18.html