Rebel had some good info. He may be getting good info on other things too, like the part about Reyna consciously picking and choosing what cases to prosecute in order to further his political aspirations?
Whatever the information was, however it made it's way to Broden, it was enough to have Broden believe it. I can't imagine that he'd jeopardize a client's case with something like that, if he had not ascertained that it could be proved. How to get a judge to make inquiry to State agencies about it though..? One could think that even hint of investigation into a matter such as that would be enough (specially in light of all else, a judge would needing only review the case history as framed in Broden's chain of motions, and the responses and recent results of those) to see there could be appearance of multiple conflicts of interest, and more. And it does add up to either; depriving his client of right to speedy trial, or else puts the defendant at unlawful disadvantage, needing forfeit a right or rights in order to enjoy other rights due to himself. Book of Waco, baby. It's that Book, again.
I got a kick out of how 'Legendary' presented one of the same quotes from today's filing, under this pic

Made the man look small, weaselly-faced, he did.
It’s Waco, face it, someone needs to report the truth, not just the truth but the gawddamned truth the way the people who were never dressed as princesses or never had the pleasure of having history altered to suit the elevated vision of “the Family”, by the church, the Shrine, or Waco in general.
ABEL REYNA UNDER INVESTIGATION BY FBI FOR “SELECTIVE PROSECUTION” in Motion filed by Clint Broden Biker Atty.