It makes no sense for Fezco and Ashtray, the drug dealers, not to have at least a peephole in their door and to just let the visitor come in when he knocks without even asking who it is. Especially not since they keep a lot of drugs at that house, as well as Fay the untrustworthy heroin addict, and their house has already been raided once by the police and they have had the violent incident with Nate's father.