TCU quarterback Casey Pachall has been suspended indefinitely after he was arrested early Thursday on suspicion of driving while intoxicated, coach Gary Patterson announced today.Pachall was booked into the Fort Worth jail and was transferred at 4 a.m. to the Mansfield jail where he remained until his parents posted the $1,000 bond around 1:40 p.m. He was later suspended from the team."My job as a head coach is to win games, educate our kids and help them with their lives," Patterson said in a written statement.Patterson said there would be no further comment. But he spoke about it on his weekly radio show on SiriusXM radio."(He's) suspended from competition until we come up with a good answer for him, how we're going to handle life and how we're going to do things," Patterson said. "So is it one game? Is it all the rest of the season? I don't know what that answer is."A police officer pulled the quarterback over about 12:55 a.m. after seeing a car run a stop sign, said Sgt. Pedro Criado."He did give a breath specimen which indicated he was over the legal limit," Criado said.Backup quarterback Trevone Boykin, a redshirt freshman from West Mesquite, will start against Iowa State on Saturday. Boykin has seen limited time at quarterback through four games this season. He's nine of 10 passing for 74 yards and one touchdown. Boykin is much more of a dual-threat quarterback; he has rushed 12 times for 122 yards and a score.Boykin received his most extensive playing time in the second half of the season-opening blowout against Grambling State. He completed all eight of his passes for 75 yards and rushed five times for 57 yards and accounted for two touchdowns while running the offense for the first time."We actually have more offense with Trevone Boykin in the game than we do with Casey Pachall in the game because he can throw all the throws, but now you have a very athletic guy that can do a lot of other things that Casey can't do," Patterson said. "In a lot of ways it bothers Iowa State because they've got to get prepared for something they weren't ready to be prepared for."It's the second time this year that Pachall has had problems with substance abuse.In August, Pachall apologized after a Fort Worth police report revealed that he had admitted to failing a drug test in February. Pachall was questioned by police when four TCU players were arrested for selling drugs. One of those arrested, Tanner Brock, was Pachall's roommate. Those four players were dismissed from the team. In the wake of the drug bust, a source told the Star-Telegram that five players tested positive for marijuana after Patterson ordered a team-wide drug test on Feb. 1. Eleven other players had trace amounts of marijuana in their systems, according to the source."I truly do apologize for what's been said and done on my behalf lately, and in the past as well," Pachall said at the time. "I've made mistakes. I know I'm not perfect. But I've learned from those mistakes and I'm still learning. It's a day-to-day process for me trying to be a better person and trying to be a better role model and leader for this team and this community and this university."At the time, Patterson said Pachall "went through the university drug and alcohol awareness" program that is required of first-time offenders "to be on this campus.""For me, kids screw up, there's team policies, there's university policies, there's rules and he knew what was in place," Patterson said. "The media and everybody else is going to make this about Casey Pachall. The thing head coaches do is we don't make this about Casey Pachall. I mean if I do, then I'm saying everybody else is not important."What I'm going to do, we're going to go out and practice and get ready to beat Iowa State. That's how you stay somewhere 15 years. You stay somewhere 15 years because you don't lose sight of what your initial goal was anyway. It's always been about 'we' it's never been about 'I' or one person."The TCU roster has taken a beating since the end of last season. The Frogs have lost 20 players to injury, academic issues or dismissal.