I guess this doesn't matter as you've found out they are illegal, be here is a nifty tidbit about batons all the same.
We were recently issued them as a dismounted patrol "accessory", for when shooting just wouldn't be appropriate (detaining an IED cameraman, for example) so we decided to test them.
Someone rustled up an old SAPI ballistic vest plate. A good hard swing by a big man resulted in a plate cracked in two.
These are rated for up to 7.62 ballistic protection, BTW.
Not a subjective test as this one had already been hit, but certainly enough to make me want to stay clear of the business end of one