The impact is greatest when new grounds for setting aside guilty pleas are approved because the vast majority of criminal convictions result from such pleas. Moreover, the concern that unfair procedures may have resulted in the conviction of an innocent defendant is only rarely raised by a petition to set aside a guilty plea.Timmreck, 441 U.S. 780, 784 (1979) (quoting United States v. Smith, 440 F.2d 521, 528-529 (7th Cir. 1971) (Stevens, J., dissenting)). Though Timmreck was based on an interpretation of the federal rules, the underlying principle is the same in Texas. The Supreme Court noted that a federal rule violation "does not present 'exceptional circumstances where the need for the remedy afforded by the writ of habeas corpus is apparent.'"