Snowdrop (or Snow as most know him by) is about 16 and yet already works fulltime making medicines, so Ren could have definitely delivered supplies to the labs and been greeted by a kid |Da Despite the giant nerd job, he's a friendly and talkative guy, so Ren's welcome to have hung out if he was done with his shift - in areas where sensitive information was not readily available, naturally.

I can also offer Snow as a reason Ren may have tested medicines but 1. it'd have to be voluntary and 2. the medicines aren't anything too crazy, mostly healing salves and the like. But he'd pay for the help, too! Snow is a legit good boy, so all research and experimental medicines would be tested on the up and up with a control and treatment group, etc.