Wise County Texas is notorious for pulling people over and even more notorius for throwing them in jail when they cock up. Hopefully there is video footage of the arrests, even more, hopefully the footage from the dash cams have been released. That will show if he maintained a good behavior while they accosted him.
When going through anywhere in the State of Texas, don't even use the 5 mph "safety net" as there is no such thing and you don't know when someone police or DPS department has instituted an illegal quota system. Instead driver no more than 2 mph above or below the posted limit.
Make sure you stickers are up to date, tires are good, etc, use those turn signals. use your phone on speaker mode, etc.
Then as finnian says make sure you get good legal counsel. if he's innocent I don't see why he's still in jail. The only reason I can see him being in there this long is that they think the have a felony offense case in which case they can hold him for up to 3 months until the Grand Jury meets to decide if they should prosecute or not.
Have they read him rights yet?
Has he been indicted?
In Texas you have 72 hours to receive an indictment, the initial official charge of what they think you have done. If has not you need to find him a lawyer asap to represent him to get out. Cash in on those Steem dollars you're accruing. I'm sure you can get a lawyer to get him out.