Cops smelled weed

So last night my wife, 14 weeks pregnant, was having some serious cramps and wanted to go to the ER but wanted me to stay home with our 3 year old as he was asleep. She called the non emergency number and they sent out two sheriff’s deputies and an ambulance. About two hours before I had smoked a joint in the garage. After my wife had been loaded on the ambulance one of the officers pulled me aside and told me “Off the record we could smell the odor of weed in the home. With her being pregnant and a 3 year old in the house that’s child endangerment. Weed is illegal here.” He didn’t search the house or anything and left after telling me that. My wife prefers that I smoke a joint a night instead of drinking two or three beers when I get home and I agree but my concern now is that the police will come back or file with CPS. So my question is what can they do about it if anything?

Edit: We live in Idaho where it’s not recreational or medically legal