Can I force my adult son to accept help?

My nearly 30 year old son is on a downward spiral. He has a history of prescription drug abuse. Now he is on a prescribed drug from some type of clinic that replaces the hydrocodone that he used to get illegally. He's also on zoloft for depression. He has lost everything, most recently his job of 4 years and his wife of 3 years. He takes advantage of friends and family, borrowing and never returning money and food. His landlord has just filed for eviction. I've been providing a car and insurance, and lately gas. Often I give him money or stock his fridge. His rental trailer is cluttered and dirty beyond description. He lives in a fantasy world of lies, failed plans, and unfulfilled promises. Many days he can't get out of bed. Usually he won't answer his cell phone which I also provide to him. I think my son is a suicide waiting to happen. I am at a loss for direction for him or me. I've been told that I should call police to report his lack of interest in life. I do not know what to do or not do. I am open for suggestions. I have offered a room in my home until he gets 'straightened out'. He wants no part of that. I hope to not hear from those who can not constructively contribute intelligent information. Thank you.