While agents conducted an intensive inspection of defendant’s car at the border, he was taken to the inspection station’s security office, patted down, and placed in a locked holding cell, where his shoes and belt were confiscated. The court concluded that the defendant was in custody for purposes of Miranda v. Arizona (1966) 384 U.S. 436 upon being placed in the holding cell. However, the failure to suppress his statements was harmless in light of overwhelming guilt.