Do the words decaffeinated have to appear on any cans or packages of decaf coffee?

Yes, the words "decaffeinated" or "decaf" must appear on cans or packages of decaffeinated coffee.

This is because the Food and Drug Administration (FDA) requires it for accurate labeling and to prevent consumer confusion.

The FDA specifically states that "any coffee product that contains less than 0.5 percent caffeine must be labeled as "decaffeinated" or "decaf".