Drug detox program

Years ago we rented an apartment to a nice young family at our tenant house. Everything was going good for the first four months when it came for them to pay their rent on time. I happen to be on the phone one day asking for rent when the husband started screaming in the background about paying the rent. All this time he has been very nice now he's like this. His wife told me that he was back into his bad habit. I recommended a good drug detox program but she says that it is going to take more than her to get him into any program. Because I needed the rent money I volunteered to talk to him.  Hopefully I can help the situation.