It is looking as if Omar Mateen could have and should have been stopped.

[jberryhill]

25. "bring him in for questioning"?

Let me see if I understand you.

You believe, that in the United States of America, a person who has committed no crime and for whom there is no probable cause to believe they have committed a crime, can be taken into custody, forced to submit to questioning, and given a polygraph test?

You actually believe this?

Okay, fine, we'll take that as something that is actually legal.

Now, you have him in custody. You start asking him questions. He says that he prefers to remain silent and does not consent to a polygraph test.

What do you do next?

Furthermore, where is this "other evidence" coming from? We search his house too?

"generally revisit the investigation."

Okay, the investigation last time around did not find that he had done anything illegal (and, in fact, he hadn't). What would be turned up in "revisiting" it? That he had been an armed security guard, had a habit of saying obnoxious things, and has been carrying firearms for years without committing any crime.

What then?