Disclaimer: My DD never used a rolled bat, she always used Rocketechs.
It's already been mentioned, but the advances rolling did for bats 10+ years ago are minimal to non-existent now. Rolling simply speeds up the pop, which doesn't take much to get today's bats seasoned by design and limitations.
Let's say you've done the right way, broke your bat in by hits ( acknowledging you know what you're doing ), got that sucker primed. A week before Nationals, high school playoffs, college playoffs, someone steals your bat. Rolling a brand new bat will not do anything or add anything vs the primed bat you broke in by hits. It only makes it equal.
Since we know rolling ( and only if it's done correctly ) will not advance performance beyond hit "breaking in", it won't make it anymore dangerous than Susan's stick with 300 good hits, let's compare it to the glove.
Sally has sat on the couch with her glove for hours bending, throwing balls in the pocket, stretching the fibers. After 6 months that glove is as soft as a fur coat and the deep pockets of a congressman. That glove gets stolen before Nationals, high school playoffs, college playoffs. Should she be allowed to buy a new glove, use a "glove oven" to make that glove as "hot" as her old one?
Before anyone gets crazy about safety, rolling ONLY gets a bat to 100%, nothing more nothing less. So we can use accelerated methods of "break in" for certain equipment, but not others?
Look for cracking on the barrel. On an old bat that has seen 400+ hits it is common and no way of really telling. If the bat is new and there are cracks(not just one or 2, but over the entire barrel) good chance it was rolled.
And what about microwaving the balls? haha
How do we know that? Good bat rollers are very precise about the amount of pressure they apply to achieve maximum performance and they do it very uniformly. I don't see how anyone could be as accurate by hitting balls.Let's say you've done the right way, broke your bat in by hits ( acknowledging you know what you're doing ), got that sucker primed. A week before Nationals, high school playoffs, college playoffs, someone steals your bat. Rolling a brand new bat will not do anything or add anything vs the primed bat you broke in by hits. It only makes it equal.
Since we know rolling ( and only if it's done correctly ) will not advance performance beyond hit "breaking in", it won't make it anymore dangerous than Susan's stick with 300 good hits, ...
Ah, it's not the sword - it's the swordsman. Smells like a red herring to me...IMHO - The great hitter with an old alloy bat is far and away more dangerous than the average player with a juiced composite.