It's a good time to revisit this discussion about Bilal's arrest from almost 7 years ago.

https://old.reddit.com/r/serialpodcast/comments/575t8v/doesnt_appear_charges_were_trumped_up/

It includes gems like this from u/Nursedoubt:

Remember, B was arrested the night before the 2nd trial, where he was due to take the stand. He did not show at that trial & was released soon after & charges dropped. B would have known that Adnan was at the mosque on the evening of Jan. 13. There were many other witnesses for Adnan as well, but CG didn't contact them.

It is obvious that LE was working w/the prosecution to frame Adnan.