Good afternoon, i have a questions about a case Comstock v McCrary ( course legal research)

What's the legal standard for determining a constitutional violation in this case?

What did the expert witnesses for plaintiff say about the March 3, 1995 interview with Mr. Montgomery?

What does the Court rule with respect to Mr. McCrary's conduct? What's the Court's holding?

link: https://caselaw.findlaw.com/us-6th-circuit/1017809.html

Thank you so much.