Cold Turkey on cocaine isn’t life threatening, isn’t nice but more of a challenge of self power ???? the sad thing is if you want it then you absolutely need it and nothing will stop you buying it, nothing. If your mental health is unbalanced then all you want is cocaine to make you function and I suspect she will still be using but probably in hidden form now and then. This all depends on what level she has been using because it’s easy to get addicted and easy to spend £100+ a day! or £100 a week. I’ve have associates run up 50k in credit cards and loose houses only for a wife to find out a year later that they no longer have a home. It’s painful to watch. I have a child and the only important thing in life is that child! Regardless of my wife, my job or money in the bank so the children in this relationship are top priority above anything. I’m sure your son and you wish that nothing is disclosed but this is not an unusual situation in the forces and help is available for all of you if needed, especially in the forces as addiction with partners is more common than KFC. It’s probably not an option but it can be done without affecting his position but she needs to submit full disclosure and get help, if indeed she is a regular user. Yes she has failed a test but that could be down to what’s called a “cheeky few lines” when she has been out with friends or just hitting rock bottom ( the odd bag of cocaine over 6yrs isn’t an addiction) but I never trust addicts until I see a regular clean test and let’s face it alcohol is far worse than cocaine. The children are no joke in this though and are 1000% top priority over anyone which you already know so let’s hope she’s not a hard and fast user and if they do split then maybe that’s the best option in a toxic situation and your son can keep an eye on her with visiting. Finally, cocaine in my experience has always been a drug that still makes you sneaky in the fact that it’s easy to hide if you have the money and at points in my life I could one minute be Teaching pupils and then doing lines of cocaine in the staff toilet but still be a functional citizen. I don’t work in education now and I don’t use cocaine thankfully so I guess the only option you have is for your son to make the move and split and for you to stand by him or try and make ground with her. She probably just suffers mental health issues and needs professional help. I’m sure nothing I’ve said makes sense but I hope you have success