Massachusetts Department of Public Welfare v. United States

How later courts describe this case

• discussing waiver doctrine in administrative law under the label of the procedural default doctrine
• defendant not in custody when he voluntarily went to police headquarters and was free to leave
• suspect held not to be in custody when he voluntarily went to police headquarters and was free to leave even though the interrogation lasted seven hours and the defendant was subjected to a polygraph test
• "current participant status is the relevant test"