I am in Wisconsin, and have the Draeger interlock. Didn’t do any research, that just happened to be the brand the company that was first on the list that I called had. I have had no issues like others have listed here. I never eat or drink in the car (other than water) so as not to tempt fate, but have had no false positives or anything like that. It uses the blow then suck back system, rather than humming, which I think is easier and less annoying. Best of luck to you.