The Ill-Annoy Bill Of "Rights"

SECTION 22. RIGHT TO ARMS
Subject only to the police power,the
right of the individual citizen to
keep and bear arms
shall not be
infringed.

(Source: Illinois Constitution.)

Now, I'm a simple man, so someone please tell me how a RIGHT
can be subject to something so nebulously defined as police-power...

Thanks, TJH.