According to the Ravens, they had rookies suit up in pads for a non-contract drill for about five minutes. They didn't remember that under the current CBA, all practices held before training camp are to be completed without pads. Once they found this out, they quickly pulled their players off the field.
It's really a non-story, but it's funny to mention given that the Ravens have been the center of a ton of controversy and whining, especially when it comes to the Patriots. Maybe Tom Brady was right after all. Maybe they really do need to study the rule book.