As a society we do not understand addiction. An addict requires a support system, and the only system that really works is a twelve-step program, daily contact with another addict, and attending daily meetings to maintain sobriety.
Addiction is the only illness that tells you ‘If you feel alone, stay home by yourself to feel better’. The mind of an addict is a dangerous place for the addict to be alone. It is easy for an addict to forget one is not normal and that any mind-altering substance will only lead to inner-isolation, hopelessness and death.
Isolation for an addict happens within; feeling alone among hundreds of people. Not sharing emotions, feelings, challenges, and fears in a daily basis with another addict or a twelve-step group, the addict slowly falls into a depressive estate that eventually leads to hopelessness. This factor is multiplied when the addict is still using substances.
When an addict walks slowly away from his recovery program, the road to hopelessness sets in. Social alcohol use and peer pressure can tip the balance for an addict who just wants to live ‘a normal life’.
Would it be possible for employers to know an addict should not be drinking? 
That is the issue we want to look at, how the demise of an addict who has stepped away from his recovery can be of help to our society. Would his employers have been able to bring a twelve-step program to him, and would that have been what the addict wanted? Could have they required from him to be sober in order to do his work? This is what a twelve-step program suggests.
Recovery for an addict is based on rigorous honesty, honesty with himself, another human being, and his personal concept of a higher power. This requires not using substances and a vigilant practice of self-honesty, and meditation. An addict that has become familiar with a recovery program knows this very well, but addiction is a chemical reaction where the addict cannot stop using a substance once he allows himself to use it. 
The first drink for an alcoholic is the one that kills him; once he relapses, hopelessness sets in and the compulsion to continue using is triggered. Loosing control and letting go of his support system eventually leads the addict back into the abyss of low self-esteem, depression, hopelessness and in many cases death. We don’t see this from the outside.
Employers need to learn more about addiction and how to work with addicts in recovery; hiring one that is in the middle of a relapse is like having a bomb waiting to go off. Employees need to take responsibility when they hire addicts and should provide the needed support system they require in order to help them maintain sobriety and in the end not contribute to their imminent death.