The Ninth Circuit reversed a finding by an Immigration Judge that a petitioner knowingly assisted in the smuggling of his mother-in-law and sister-in-law into the United States. The Immigration Judge credited the testimony of the petitioner's wife that she was solely responsible for the attempt to smuggle her mother and sister into the United States, but refused to believe the accounts of the petitioner and his son, both of whom testified that the petitioner was not involved in the endeavor. The Ninth Circuit noted that the Immigration Judge failed to sufficiently explain why he credited the testimony of the petitioner's wife, but not the testimony of the petitioner and his son, despite their consistent accounts.
The full text of Perez-Arceo v. Lynch can be found here: http://cdn.ca9.uscourts.gov/datastore/opinions/2016/05/12/12-70635.pdf