Retired cop here. This is an important principle for people to remember. If a cop suspects you of something, human nature dictates that he will be listening to you with a head full of confirmation bias. If he's just on a fishing expedition, casual conversation can give him something that meets the standard for some sort of violation.

Now that we've decided that governors can obviate the Constitution with executive orders, it can be even harder to know where the lines are drawn. Unless you're certain you're saying something exculpatory, it's best to just decline unnecessary conversation.

Oh, and don't lie. Refusing to discuss something is never criminal (unless they've changed that when I wasn't looking), but lying about some things might be.