Board Thread:Manga/@comment-5774380-20160908231942/@comment-29966962-20160917080556

Im pretty sure people in the walled world had little to no knowledge of modern syringes. If it were the case, you would see doctors and nurses administering medicine in this fashion. The Riess family were probably the only ones with access to it, apart from Grisha. Either way, Grisha pulling out a syringe inside the walls are the closest the walled world is gonna get to "modern" imo, unless someone else can point something else out.