PITTSBURGH — A 16-year-old student charged with stabbing 20 fellow students and a security guard at Franklin Regional High School has waived his right to a preliminary hearing.

By waiving the hearing, which had been scheduled for Wednesday, Alex Hribal and his defense attorney acknowledge Westmoreland County prosecutors have enough evidence for the case to proceed to trial.

Defense attorney Patrick Thomassey didn’t immediately return messages for comment with the waiver he filed Monday. But Thomassey has said he plans to ask a Common Pleas judge to move the case to juvenile court, where Hribal would face incarceration or probation only until he’s 21.

If the case remains in adult court, the Franklin Regional sophomore faces decades in prison if he’s convicted. All the victims have been released from hospitals.