I don't know what support the NFL gives these guys who are suspended but I would hope they just don't ignore them. That isn't going to help anybody overcome drugs/booze. I realize the team itself isn't supposed to have any contact with the player but the NFL should help these guys in some fashion. You don't just ban a player and turn your back on them completely.
I'm sure you could find the policy on nfl.com somewhere but I can tell you that I worked at a rather famous MN treatment center when we had an in-service presented by a clinician who consults with the NFL. I asked him some questions about the policy after his presentation over lunch and he gave me a rough run-down of the program.
If you don't outright retire after a violation or unless you were never rostered for like some minimum number of games, you MUST enter the NFL substance abuse program....even if you're a free agent. Upon admission, everyone is in stage one and REQUIRED to be evaluated. There are "regional teams" of professionals who will then determine whether or not a treatment plan needs to be developed. If one isn't in order....umm......like say you were just on some cruise were people were blowing coc or something but you, yourself, were just playing cards the whole time.....well then you're discharged and all is well. But if one is necessary you're referred to some approved treating clinician or program and must follow all requirements for the length of that "stage" which includes random observed testing if they so choose. The program itself is three stages....failure to comply bumps you from 1 to 2, 2 to 3...etc. If you successfully complete and are discharged....from stage 1 or 2....you're free to go. Once you're in stage three....you're in for life. SO...they give them a robust amount of support from sound professionals should the player decide to take advantage of it.
Regarding Robinson specifically, I think we can safely assume Koren was in stage 3 given his Hx. Also...the long suspension is the fine for a stage three violation.....1 and 2 were just like some # of games and some cash. We can also guess from his Hx, especially his past trt failures, he'll LIKELY be required to do inpatient, rather than outpatient trt. This is a bit of an assumption, but I think he's also probably a good candidate for extended aftercare as well following his primary treatment.