The firearm enhancement statute laying a possible five-year prison sentence over actor Alec Baldwin's head was revised after the "Rust" shooting.

On the latest episode of "Objections," former prosecutor Mitch Epner explains why that matters: the ex post facto clause of the U.S. Constitution, handing the actor a powerful tool to eliminate by far the most stringent possible penalty against him.

In a wide-ranging interview, Epner reviews the documents released by prosecutors against Baldwin and his co-defendants and explains why he thinks the actor did himself no favors by agreeing to talk to ABC News.

"He believes himself to be very good at talking," Epner said, referring to Baldwin. "And what I try to explain to my clients is that no matter how good you are at talking, no matter how much money you've made at talking, the only reasonable thing to do when you are under criminal investigation is shut up."

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