How can drug intervention help my husband?

My husband has been on drugs for four years now and he still refuses to get into a drug rehab. When we talk about his addiction, we always end up arguing because he would not admit his being an addict. He would even tell me that I should not interfere with whatever he is doing. My friend told me to try having a drug intervention but I am afraid that it would just aggravate our situation. What should I do?

More Meth Drug Addiction Info: