I found it surprising too, on the basis of, it could pose perceived or actual conflicts of interest in their work. And of course the performance and/or liability risk on the org.

But you skipped the part of the quote where he's been abusing drugs since age 11 - it'd certainly be more alarming if he was sober but after working at the clinic for a bit, started taking up IV meth. But yes, still surprising, however there are benefits to serving the people that you can relate most to.