One-time, in this case, refers to the police.
(Who’s more crooked than the cops?)
The police are very ambiguous in Lupe’s eyes: they’re supposed to protect people, yet they do a lot of harm to the community.
This song is called “Twilight Zone”, which (by definition) is “a conceptual area that is undefined or intermediate”. Lupe is explaining that the police haven’t been defined as crooked/dangerous yet.
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