No, they don't do behavior profiling. But a mental health agency is very well versed on the symptomology of drug abuse and addiction. The symtoms of addiction are usually not blantant, and what the vast majority of society would not even recognize as an issue with addiction. I don't know of anyone who is not willing to become involved in an intervention regarding someone at work who is having a problem with drugs or alcohol. We see it as an illness, not a comment on their morality.
Yes, they are suspended with pay until treatment is completed. But seriously, you would be amazed at the number of people who work with others on a daily basis is responsible postions that have issues with drug/alcohol abuse and addiction. Check the medical professionals, the legal system, or anyone you would least suspect to be involved. That is usually the place you find a great deal of unrecognized and untreated addiction.