Probably gets hazard pay.
As you can see for yourself in the report below, this isn’t just one or two people on scattered mornings. This is a dozen people, some shooting up as commuters walk past. Others are already passed out. A spokesman for BART told CBS, “It’s a real concern for our riders, and we appreciate that.” He added, “But what we have to do is make the most of the resources, the limited resources that we have.” (nice try to get more $$$...)
http://sanfrancisco.cbslocal.com/2018/04/25/drug-users-san-francisco-civic-center-bart/