Naive is correct, and unless he has a metabolism that works at twice the speed of sound, he will possibly be permanently over the legal limit.
My late Ah never told me that a work collegue did a breathalyser test on him at work one day, and freaked at the reading. XAH had not had a drink since he'd passed out in his chair at 11pm the night before, that was 12 hours before the breath test.....mind you, by then he'd guzzled his way thru 5 litres of moselle.
I heard about it some time later, and realized that XAH must have been off the dial when he drove to work at 6am each day, and still well over coming home at 4pm. He had done this for at least 5 years, and boy did my blood run cold.
Take whatever measures you believe you need to keep yourself and your children safe, and if you think he is legally drunk driving, then call the police. You know now what he is consuming, so what you are after is proof of his alcohol abuse for legal purposes.....that is not snooping....that is smart.