It's called science, you knuckle-dragging pillock, and any snotty-nosed kids will be assumed to be crawling with plague and hauled off the ice before they take down the rest of the team. That's a USA Hockey rule. Any parent who doses up a kid with Tylenol to bypass temperature testing will be found out and their kid is going to be a pariah.
No, rink owners don't have to be virologists. In fact, it's all been made excruciatingly simple, so simple that it defies logic that so many people can't understand how to behave in simple ways that will make this all end sooner rather than later. Follow the CDC and state rules which in PA now include no more than 25 people indoors at a time, wear a mask, wash your manky hands, make sure people are 6 feet apart on and off the ice, and then clean the hell out of everything every time someone comes near it. It's not rocket surgery.
You wanna shut down your rink, then invite those people in, the no-mask-wearing sovereign citizens who think their kid's swanning around on the ice while swatting at pucks is doing the leauge some great favor. I don't hear any teams stepping up to support their rinks by offering to pay the fines once they start dropping, no team moms offering to hold bake sales to pay the rink's legal fees. As soon as their rink owner is fined for allowing quarantine-state players in or any other reckless behavior, it will be all finger pointing and who me? and pulling empty pockets out.