We have been seeing some of the terrible consequences of methamphetamine abuse.
Where I live it is normally called and sold as "Crystal meth," and it is the worst type of drug that I have ever seen: and I've seen most things over a busy career during which I've consulted in many countries.
Apart from the personal cost, there can be few things more devastating to a family than discovering a loved one destroying their life with this highly addictive group of compounds. I thought that you may be interested in a resource published a couple of months ago on PsychiatricResourceForum.blogs.com.
There is also another article on the same blog about some of the new principles of helping the recovery of people with chronic mental illness. But interestingly, many of the same principles apply when helping people with addictions.
These are very useful resources. Though designed for healthcare professionals, they will, I think, be of value to anyone who comes into contact with drug using people. And that is far more of us than most people ever realize.