My ex partner has a history of driving under the influence both on nights out and the morning after. We split a month ago after I found out he used cocaine on one of his bi(sometimes tri) weekly alcohol binging sessions. He has been seeing our 5 month old child twice a day at my home and never had any complaints. His mother also visited her grandchild at my home without him present. Last week I fell out with his mum when she refused to stop kissing my son on the mouth despite repeated requests. She no longer wants to see my son around me. This has led to my ex requesting to take him to the garden centre for an hour once a week so that she can see him. I have been driving him there and waiting in the car park to drive him home afterwards. Today he mentioned further unsupervised access and I said I would be happy to but I want him to take a drugs test first. He completely flew off the handle and said what he does isn't my business as we aren't together and that I'm being spiteful. I wondered if anyone had experienced similar and has any idea what my next steps should be/what the outcome is likely to be. I have already made a report to social services when I found out about his use. They closed the case satisfied that I am doing everything I can to protect my child but told me to seek legal advice should he want unsupervised. I'm just terrified about him having him alone.