In Interest of Ra

VANDE WALLE, Chief Justice.

R.A. appealed from an order of the district court of Stutsman County requiring that he be hospitalized and treated for mental illness for a period not to exceed 90 days. Because the order is supported by clear and convincing evidence, and because R.A. may not impeach the validity of the order by a collateral attack on the previous order under which he was committed, we affirm.

On March 4, 1994, R.A. made an initial appearance on a charge for aggravated assault for stabbing a worker with a butcher knife at the Grafton Developmental Center. On April 7,1994, a hearing…