In In re Troy Z. (1992) 3 Cal.4th 1170, 840 P.2d 266, the Supreme Court held that the parents' no-contest pleas to a dependency petition foreclosed their argument on appeal that their conduct did not amount to "severe physical abuse" of their child for purposes of section 300, subdivision (e). The court stated that any other conclusion would "frustrate the clear purpose of the statutory scheme, which quite plainly contemplates expedited placement of those children for whom reunification is unlikely to prevent reabuse." ( Troy Z., supra, at pp. 1181-1182.)