"We’re going to have to do all of this the muggle way," Remus decides. Sirius’ heart clenches at the "we". "He’s in the muggle system, so we’ll have to get him out the muggle way. Then, even if he knows about magic and the like, we’ll have to keep him mostly in the muggle world. That way, everyone can continue thinking the Boy Who Lived is hidden away with the Dursleys or wherever they think he is, and no one’s attention will be drawn to him, good or bad."