[Dov in Houston]

Yes the constitution is what defines and mandates our laws

They were not even detained.

They were not denied theit constitutional rights

They refused to answer questions and if they invoked their "right not to answer any questions on the grounds that it may tend to incriminate me" was not anywhere in the article. And if it was I stand corrected.

[ndt]

"They refused to answer questions and if they invoked their "right not to answer any questions on the grounds that it may tend to incriminate me" was not anywhere in the article. And if it was I stand corrected."

That is exactly what you are doing when you refuse to answer questions. You do not have to cite the amendment, it is automatically invoked by your refusal.