TCU quarterback Casey Pachall withdrew from school and will seek care at a drug and alcohol treatment facility, coach Gary Patterson said. Patterson said Pachall has an opportunity to enroll in the spring semester and rejoin the team."We want to make sure we can make this turn into a positive," Patterson said. "Casey's parents, Casey and I, we all agreed that there was only one way to change the path he was on - to step away from it."Last week, Patterson suspended Pachall from competition after the junior's arrest early Thursday morning on suspicion of driving while intoxicated. Pachall did not play in the Frogs' 37-23 loss to Iowa State last week.Pachall started every game in 2011, setting TCU records for yards and completions. He was off to a good start in 2012 as the Frogs won their first four games.In July, a police report revealed that Pachall admitted to police that he had failed a Feb. 1 team-issued drug test. Later in February, four players, including Pachall's roommate Tanner Brock, were kicked off the team after being arrested for selling drugs in a campus-wide drug bust. Pachall told police that he had tried cocaine and ecstasy in the past.