If anything, currently imprisoned criminals should
definitely keep receiving at least some of their UBI, so they can land on their feet when they're released rather than just resorting to crime again.
I see no reason why we should exclude drug addicts. What level of drug do you start to count against a person? More people die from alcohol than marijuana, and I barely know anybody who isn't on some level addicted to caffeine. Prescription opiates are entirely legal, but lots of people are addicted to those.
The willfully unemployed are more or less the entire point of UBI. The theory is that as society increasingly moves towards automation, there will be fewer and fewer jobs, making the willfully unemployed a rapidly growing segment of the population, and that's a good thing as it will allow people to do with their time what they will.